diff --git a/jsonobject/__init__.py b/jsonobject/__init__.py
index 2d4719f..b23fcde 100644
--- a/jsonobject/__init__.py
+++ b/jsonobject/__init__.py
@@ -9,6 +9,6 @@ __all__ = [
     'IntegerProperty', 'FloatProperty', 'DecimalProperty',
     'StringProperty', 'BooleanProperty',
     'DateProperty', 'DateTimeProperty', 'TimeProperty',
-    'ObjectProperty', 'ListProperty', 'DictProperty',
+    'ObjectProperty', 'ListProperty', 'DictProperty', 'SetProperty',
     'JsonObject', 'JsonArray', 'AbstractDateProperty', 'JsonProperty'
 ]
diff --git a/metautil.py b/metautil.py
index 81689dd..d9ba151 100644
--- a/metautil.py
+++ b/metautil.py
@@ -196,6 +196,7 @@ class MultiMCVersionFile (JsonObject):
     releaseTime = ISOTimestampProperty(exclude_if_none=True, default=None)
     time = ISOTimestampProperty(exclude_if_none=True, default=None)
     type = StringProperty(exclude_if_none=True, default=None)
+    addTraits = SetProperty(StringProperty, name="+traits", exclude_if_none=True, default=None)
 
 def MojangToMultiMC (file, name, fileId, version):
     mmcFile = MultiMCVersionFile(
@@ -235,21 +236,27 @@ The MultiMC static override file for legacy looks like this:
 '''
 
 class LegacyOverrideEntry(JsonObject):
-    id = StringProperty()
-    checksum = StringProperty()
-    releaseTime = ISOTimestampProperty()
-    type = StringProperty()
-    mainClass = StringProperty()
-    appletClass = StringProperty()
-    addTraits = ListProperty(StringProperty, name="+traits")
+    releaseTime = ISOTimestampProperty(exclude_if_none=True, default=None)
+    mainClass = StringProperty(exclude_if_none=True, default=None)
+    appletClass = StringProperty(exclude_if_none=True, default=None)
+    addTraits = SetProperty(StringProperty, name="+traits", exclude_if_none=True, default=None)
 
 class LegacyOverrideIndex(JsonObject):
-    versions = ListProperty(LegacyOverrideEntry)
+    versions = DictProperty(LegacyOverrideEntry)
 
-class LegacyOverrideIndexWrap:
-    def __init__(self, json):
-        self.index = MojangIndex.wrap(json)
-        versionsDict = {}
-        for version in self.index.versions:
-            versionsDict[version.id] = version
-        self.versions = versionsDict
+def ApplyLegacyOverride (mmcFile, legacyOverride):
+    # simply hard override classes
+    mmcFile.mainClass = legacyOverride.mainClass
+    mmcFile.appletClass = legacyOverride.appletClass
+    # if we have an updated release time (more correct than Mojang), use it
+    if legacyOverride.releaseTime != None:
+        mmcFile.releaseTime = legacyOverride.releaseTime
+    # add traits, if any
+    if legacyOverride.addTraits:
+        if not mmcFile.addTraits:
+            mmcFile.addTraits = set()
+        mmcFile.addTraits = mmcFile.addTraits.union(legacyOverride.addTraits)
+    # remove all libraries - they are not needed for legacy
+    mmcFile.libraries = None
+    # remove minecraft arguments - we use our own hardcoded ones
+    mmcFile.minecraftArguments = None
\ No newline at end of file
diff --git a/separateVersions.py b/separateVersions.py
index 02253bf..4909cf2 100755
--- a/separateVersions.py
+++ b/separateVersions.py
@@ -41,12 +41,8 @@ def addLWJGLVersion(versions, bucket):
 
 # get the local version list
 staticVersionlist = None
-try:
-    with open("static/minecraft.json", 'r', encoding='utf-8') as legacyIndexFile:
-        staticVersionlist = LegacyOverrideIndexWrap(json.load(legacyIndexFile))
-except:
-    staticVersionlist = LegacyOverrideIndexWrap({})
-legacyIDs = set(staticVersionlist.versions.keys())
+with open("static/minecraft.json", 'r', encoding='utf-8') as legacyIndexFile:
+    staticVersionlist = LegacyOverrideIndex(json.load(legacyIndexFile))
 
 lwjglVersions = {}
 for filename in os.listdir('mojang/versions'):
@@ -87,6 +83,8 @@ for filename in os.listdir('mojang/versions'):
                 addLWJGLVersion(lwjglVersions, keyBucket)
         versionFile.libraries = libs_minecraft
         filenameOut = "multimc/net.minecraft/%s.json" % versionFile.version
+        if versionFile.version in staticVersionlist.versions:
+            ApplyLegacyOverride (versionFile, staticVersionlist.versions[versionFile.version])
         with open(filenameOut, 'w') as outfile:
             json.dump(versionFile.to_json(), outfile, sort_keys=True, indent=4)
 
diff --git a/static/minecraft.json b/static/minecraft.json
index 9c08a83..d30db4c 100644
--- a/static/minecraft.json
+++ b/static/minecraft.json
@@ -1,587 +1,348 @@
-{ 
-"versions": [
-	{
-		"id": "1.5.2",
-		"checksum": "6897c3287fb971c9f362eb3ab20f5ddd",
-		"releaseTime": "2013-04-25T17:45:00+02:00",
-		"type": "release",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "1.5.1",
-		"checksum": "5c1219d869b87d233de3033688ec7567",
-		"releaseTime": "2013-03-20T12:00:00+02:00",
-		"type": "release",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "1.5",
-		"checksum": "fd11cbc5b01aae1d62cff0145171f3d9",
-		"releaseTime": "2013-03-07T00:00:00+02:00",
-		"type": "snapshot",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "1.4.7",
-		"checksum": "8e80fb01b321c6b3c7efca397a3eea35",
-		"releaseTime": "2012-12-28T00:00:00+02:00",
-		"type": "release",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "1.4.6",
-		"checksum": "48677dc4c2b98c29918722b5ab27b4fd",
-		"releaseTime": "2012-12-20T00:00:00+02:00",
-		"type": "release",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "1.4.5",
-		"checksum": "b15e2b2b6b4629f0d99a95b6b44412a0",
-		"releaseTime": "2012-11-20T00:00:00+02:00",
-		"type": "release",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "1.4.4",
-		"checksum": "7aa46c8058cba2f38e9d2ddddcc77c72",
-		"releaseTime": "2012-11-14T00:00:00+02:00",
-		"type": "release",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "1.4.3",
-		"checksum": "9cc3295931edb6339f22989fe1b612a6",
-		"releaseTime": "2012-11-01T00:00:00+02:00",
-		"type": "snapshot",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "1.4.2",
-		"checksum": "771175c01778ea67395bc6919a5a9dc5",
-		"releaseTime": "2012-10-25T00:00:00+02:00",
-		"type": "release",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "1.4.1",
-		"checksum": "542621a5298659dc65f383f35170fc4c",
-		"releaseTime": "2012-10-23T00:00:00+02:00",
-		"type": "snapshot",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "1.4",
-		"checksum": "32a654388b54d3e4bb29c1a46e7d6a12",
-		"releaseTime": "2012-10-19T00:00:00+02:00",
-		"type": "snapshot",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "1.3.2",
-		"checksum": "969699f13e5bbe7f12e40ac4f32b7d9a",
-		"releaseTime": "2012-08-16T00:00:00+02:00",
-		"type": "release",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "1.3.1",
-		"checksum": "266ccbc9798afd2eadf3d6c01b4c562a",
-		"releaseTime": "2012-08-01T00:00:00+02:00",
-		"type": "release",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "1.3",
-		"checksum": "a6effac1eaccf5d429aae340cf95ed5d",
-		"releaseTime": "2012-07-26T00:00:00+02:00",
-		"type": "snapshot",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "1.2.5",
-		"checksum": "8e8778078a175a33603a585257f28563",
-		"releaseTime": "2012-03-30T00:00:00+02:00",
-		"type": "release",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "1.2.4",
-		"checksum": "25423eab6d8707f96cc6ad8a21a7250a",
-		"releaseTime": "2012-03-22T00:00:00+02:00",
-		"type": "release",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "1.2.3",
-		"checksum": "12f6c4b1bdcc63f029e3c088a364b8e4",
-		"releaseTime": "2012-03-02T00:00:00+02:00",
-		"type": "release",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "1.2.2",
-		"checksum": "6189e96efaea11e5164b4a4755574324",
-		"releaseTime": "2012-03-01T00:00:01+02:00",
-		"type": "release",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "1.2.1",
-		"checksum": "97067a603eba2b6eb75d3194f81f6bcd",
-		"releaseTime": "2012-03-01T00:00:00+02:00",
-		"type": "release",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "1.1",
-		"checksum": "e92302d2acdba7c97e0d8df1e10d2006",
-		"releaseTime": "2012-01-12T00:00:00+02:00",
-		"type": "release",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "1.0",
-		"checksum": "3820d222b95d0b8c520d9596a756a6e6",
-		"releaseTime": "2011-11-18T00:00:00+02:00",
-		"type": "release",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.8.1",
-		"checksum": "f8c5a2ccd3bc996792bbe436d8cc08bc",
-		"releaseTime": "2011-09-19T00:00:00+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.8",
-		"checksum": "a59a9fd4c726a573b0a2bdd10d857f59",
-		"releaseTime": "2011-09-15T00:00:00+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.7.3",
-		"checksum": "eae3353fdaa7e10a59b4cb5b45bfa10d",
-		"releaseTime": "2011-07-08T00:00:00+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.7.2",
-		"checksum": "dd9215ab1141170d4871f42bff4ab302",
-		"releaseTime": "2011-07-01T00:00:00+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.7",
-		"checksum": "682419e9ed1a236c3067822d53cda1e4",
-		"releaseTime": "2011-06-30T00:00:00+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.6.6",
-		"checksum": "ce80072464433cd5b05d505aa8ff29d1",
-		"releaseTime": "2011-05-31T00:00:00+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.6.5",
-		"checksum": "2aba888864b32038c8d22ee5df71b7c8",
-		"releaseTime": "2011-05-28T00:00:00+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.6.4",
-		"checksum": "5c4df6f120336f113180698613853dba",
-		"releaseTime": "2011-05-26T00:00:04+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.6.3",
-		"checksum": "efc2becca965e4f8feb5b4210c6a4fd1",
-		"releaseTime": "2011-05-26T00:00:03+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.6.2",
-		"checksum": "01330b1c930102a683a4dd8d792e632e",
-		"releaseTime": "2011-05-26T00:00:02+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.6.1",
-		"checksum": "a7e82c441a57ef4068c533f4d777336a",
-		"releaseTime": "2011-05-26T00:00:01+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.6",
-		"checksum": "d531e221227a65392259d3141893280d",
-		"releaseTime": "2011-05-26T00:00:00+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.5_01",
-		"checksum": "d02fa9998e30693d8d989d5f88cf0040",
-		"releaseTime": "2011-04-20T00:00:00+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.5",
-		"checksum": "24289130902822d73f8722b52bc07cdb",
-		"releaseTime": "2011-04-19T00:00:00+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.4_01",
-		"checksum": "9379e54b581ba4ef3acc3e326e87db91",
-		"releaseTime": "2011-04-05T00:00:00+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.4",
-		"checksum": "71e64b61175b371ed148b385f2d14ebf",
-		"releaseTime": "2011-03-31T00:00:00+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.3_01",
-		"checksum": "4203826f35e1036f089919032c3d19d1",
-		"releaseTime": "2011-02-23T00:00:00+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.3b",
-		"checksum": "de2164df461d028229ed2e101181bbd4",
-		"releaseTime": "2011-02-22T00:00:00+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.2_02",
-		"checksum": "1736c5ba4f63a981220c2a18a4120180",
-		"releaseTime": "2011-01-21T00:00:00+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.2_01",
-		"checksum": "486d83ec00554b45ffa21af2faa0116a",
-		"releaseTime": "2011-01-14T00:00:00+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.2",
-		"checksum": "6426223efe23c3931a4ef89685be3349",
-		"releaseTime": "2011-01-13T00:00:00+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.1_02",
-		"checksum": "7d547e495a770c62054ef136add43034",
-		"releaseTime": "2010-12-22T00:00:01+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.1_01",
-		"checksum": "1f9331f2bfca81b6ce2acdfc1f105837",
-		"releaseTime": "2010-12-22T00:00:00+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.0.2",
-		"checksum": "d200c465b8c167cc8df6537531fc9a48",
-		"releaseTime": "2010-12-21T00:00:00+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.0_01",
-		"checksum": "03bd20b870dbbd121de5dca98af4e1ce",
-		"releaseTime": "2010-12-20T00:00:01+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "b1.0",
-		"checksum": "5f8733dbbf09b4e7c874661a3c29c239",
-		"releaseTime": "2010-12-20T00:00:00+02:00",
-		"type": "old_beta",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "a1.2.6",
-		"checksum": "ddd5e39467f28d1ea1a03b4d9e790867",
-		"releaseTime": "2010-12-03T00:00:00+02:00",
-		"type": "old_alpha",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "a1.2.5",
-		"checksum": "7d3a43037190970ff2e11153b5718b74",
-		"releaseTime": "2010-12-01T00:00:00+02:00",
-		"type": "old_alpha",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "a1.2.4_01",
-		"checksum": "0a1cc8c668faa6dc93fc418e8b4b097a",
-		"releaseTime": "2010-11-30T00:00:00+02:00",
-		"type": "old_alpha",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "a1.2.3_04",
-		"checksum": "b2c25a753c82a1cd228ce71469829dc1",
-		"releaseTime": "2010-11-26T00:00:00+02:00",
-		"type": "old_alpha",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "a1.2.3_02",
-		"checksum": "3ad4808ef2ac3b65d10305315260da03",
-		"releaseTime": "2010-11-25T00:00:00+02:00",
-		"type": "old_alpha",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "a1.2.3_01",
-		"checksum": "70cbab762b17c5b11fefea9b12564119",
-		"releaseTime": "2010-11-24T00:00:01+02:00",
-		"type": "old_alpha",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "a1.2.3",
-		"checksum": "25f053114e34b915e675f82d58f08711",
-		"releaseTime": "2010-11-24T00:00:00+02:00",
-		"type": "old_alpha",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "a1.2.2b",
-		"checksum": "6250fb17f8898c4d970d6bd03c229177",
-		"releaseTime": "2010-11-10T00:00:01+02:00",
-		"type": "old_alpha",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "a1.2.2a",
-		"checksum": "0f9fe018b344fd9dd849005f9bdca803",
-		"releaseTime": "2010-11-10T00:00:00+02:00",
-		"type": "old_alpha",
-		"+traits": ["legacyLaunch", "texturepacks"]
-	},
-	{
-		"id": "a1.2.1_01",
-		"checksum": "0a496e44a7b4e2f493b5893d8e5845bd",
-		"releaseTime": "2010-11-05T00:00:01+02:00",
-		"type": "old_alpha",
-		"+traits": ["legacyLaunch", "no-texturepacks"]
-	},
-	{
-		"id": "a1.2.1",
-		"checksum": "0a496e44a7b4e2f493b5893d8e5845bd",
-		"releaseTime": "2010-11-05T00:00:00+02:00",
-		"type": "old_alpha",
-		"+traits": ["legacyLaunch", "no-texturepacks"]
-	},
-	{
-		"id": "a1.2.0_02",
-		"checksum": "f5bcb4d0c0e78bc220f164b89ae9bd60",
-		"releaseTime": "2010-11-04T00:00:00+02:00",
-		"type": "old_alpha",
-		"+traits": ["legacyLaunch", "no-texturepacks"]
-	},
-	{
-		"id": "a1.2.0_01",
-		"checksum": "b2e9333e967cb89488884c2e5c715d4f",
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\ No newline at end of file