diff --git a/HMCLCore/src/main/java/org/jackhuang/hmcl/mod/curse/CurseInstallTask.java b/HMCLCore/src/main/java/org/jackhuang/hmcl/mod/curse/CurseInstallTask.java
index 60a2a1c533..b1190c012c 100644
--- a/HMCLCore/src/main/java/org/jackhuang/hmcl/mod/curse/CurseInstallTask.java
+++ b/HMCLCore/src/main/java/org/jackhuang/hmcl/mod/curse/CurseInstallTask.java
@@ -139,8 +139,20 @@ public Collection<Task<?>> getDependencies() {
     @Override
     public void execute() throws Exception {
         if (config != null) {
-            // For update, remove mods not listed in new manifest
-            for (CurseManifestFile oldCurseManifestFile : config.getManifest().files()) {
+            // For update, remove mods not listed in new manifest.
+            // ModpackConfiguration stored in modpack.json preserves the raw
+            // CurseForge manifest where fileName is missing. CurseCompletionTask
+            // resolves those file names and writes the enriched manifest to
+            // manifest.json, so read from there when available.
+            Path oldManifestFile = repository.getVersionRoot(name).resolve("manifest.json");
+            List<CurseManifestFile> oldFiles = config.getManifest().files();
+            if (Files.exists(oldManifestFile)) {
+                try {
+                    oldFiles = JsonUtils.fromJsonFile(oldManifestFile, CurseManifest.class).files();
+                } catch (IOException | JsonParseException ignored) {
+                }
+            }
+            for (CurseManifestFile oldCurseManifestFile : oldFiles) {
                 if (StringUtils.isBlank(oldCurseManifestFile.fileName())) continue;
                 Path oldFile = run.resolve("mods/" + oldCurseManifestFile.fileName());
                 if (Files.notExists(oldFile)) continue;