diff --git a/HMCLCore/src/main/java/org/jackhuang/hmcl/mod/MultiMCInstanceConfiguration.java b/HMCLCore/src/main/java/org/jackhuang/hmcl/mod/MultiMCInstanceConfiguration.java
index c93617b67..1cc52adf8 100644
--- a/HMCLCore/src/main/java/org/jackhuang/hmcl/mod/MultiMCInstanceConfiguration.java
+++ b/HMCLCore/src/main/java/org/jackhuang/hmcl/mod/MultiMCInstanceConfiguration.java
@@ -19,6 +19,7 @@ package org.jackhuang.hmcl.mod;
 
 import org.jackhuang.hmcl.util.CompressingUtils;
 import org.jackhuang.hmcl.util.Lang;
+import org.jackhuang.hmcl.util.StringUtils;
 
 import java.io.File;
 import java.io.IOException;
@@ -268,7 +269,7 @@ public final class MultiMCInstanceConfiguration {
         try (FileSystem fs = CompressingUtils.createReadOnlyZipFileSystem(modpackFile.toPath())) {
             Path root = Files.list(fs.getPath("/")).filter(Files::isDirectory).findAny()
                     .orElseThrow(() -> new IOException("Not a valid MultiMC modpack"));
-            String name = root.normalize().getFileName().toString();
+            String name = StringUtils.removeSuffix(root.normalize().getFileName().toString(), "/");
 
             Path instancePath = root.resolve("instance.cfg");
             if (Files.notExists(instancePath))
diff --git a/HMCLCore/src/main/java/org/jackhuang/hmcl/mod/MultiMCModpackInstallTask.java b/HMCLCore/src/main/java/org/jackhuang/hmcl/mod/MultiMCModpackInstallTask.java
index ba0c91082..d53a18a09 100644
--- a/HMCLCore/src/main/java/org/jackhuang/hmcl/mod/MultiMCModpackInstallTask.java
+++ b/HMCLCore/src/main/java/org/jackhuang/hmcl/mod/MultiMCModpackInstallTask.java
@@ -120,7 +120,7 @@ public final class MultiMCModpackInstallTask extends Task {
 
             if (Files.exists(patches))
                 for (Path patchJson : Files.newDirectoryStream(patches)) {
-                    if (patchJson.endsWith(".json")) {
+                    if (patchJson.toString().endsWith(".json")) {
                         MultiMCInstancePatch patch = Constants.GSON.fromJson(IOUtils.readFullyAsString(Files.newInputStream(patchJson)), MultiMCInstancePatch.class);
                         List<String> newArguments = new LinkedList<>();
                         for (String arg : patch.getTweakers()) {