Collapse Launcher provides two distinct tools for maintaining game file integrity: Game Repair and Cache Management. Both scan your local files against a remote manifest and download only what is missing or corrupted, saving time compared to a full reinstall.Documentation Index
Fetch the complete documentation index at: https://mintlify.com/CollapseLauncher/Collapse/llms.txt
Use this file to discover all available pages before exploring further.
Game repair
The repair tool verifies the integrity of your game installation by comparing every local file against the official file list. It detects missing files, incorrect file sizes, and mismatched checksums, then re-downloads only the affected files.How repair works
Fetch the asset index
Collapse downloads the current file manifest from miHoYo/HoYoverse servers. For Honkai Impact 3rd, this includes the Sophon asset list plus the AssetBundle index. For Genshin Impact, it fetches
pkg_version files and, when available, a Sophon-based reference list. For Honkai: Star Rail and Zenless Zone Zero, Sophon-based manifests are used.Check existing files
Each file in the asset index is checked:
- Existence and size — if the file does not exist or its size does not match, it is immediately flagged as broken.
- Hash verification — if the file exists and has the correct size, its content hash is computed (XXH64 or MD5 depending on the manifest) and compared to the expected value. A mismatch flags the file as broken.
.pck) files, block asset bundles, and generic files are each checked using a dedicated routine. Unused files (.diff, _tmp, .hdiff) are also detected and marked for cleanup.What repair checks
- Honkai Impact 3rd
- Genshin Impact
- Honkai: Star Rail
- Zenless Zone Zero
- Generic game files (verified against Sophon manifest)
- Audio package files (
.pck) fetched from the AssetBundle CDN - Block asset bundles (verified via block index)
- Unused or leftover temporary files (
.diff,_tmp,.hdiff)
When to use repair
Game crashes at launch
A corrupted game file often causes immediate crashes. Run a repair scan to identify and replace the affected file.
Missing textures or audio
If visual or audio assets fail to load in-game, a repair scan will detect the missing or damaged files.
After a failed update
An interrupted update can leave partially written files. Repair will fix any inconsistencies left behind.
Periodic maintenance
Running a fast check occasionally can catch subtle file corruption before it causes problems.
Cache management
Cache management is a separate tool available for Honkai Impact 3rd, Honkai: Star Rail, and Zenless Zone Zero. It is not available for Genshin Impact (which does not use a separate cache system — the Open Cache Folder button is hidden for that game). The cache system stores additional game assets — such as avatar data, scene assets, and localization files — that the game downloads on demand. Updating the cache before a new game version releases means the game starts faster after an update because the assets are already present.Running a cache check
Open Cache Management
Select Cache Update from the sidebar. The page will show an overlay if the game is not installed, needs an update, or is currently running.
Choose check mode
The Check Update button has a dropdown with two options:
- Fast check — verifies only file existence and size; recommended for routine checks
- Full check — additionally verifies file content hashes; slower but more thorough
When to use cache management
Before a major game update
Cache files for the new version can be pre-downloaded while you are still playing the current version. This reduces loading times immediately after the update.
After reinstalling or moving the game
Cache files are stored separately from the main installation. After moving game files, run a cache check to ensure the cache directory is consistent.
Cache management operates on a separate directory from the main game installation (the AppData cache path for Honkai Impact 3rd). It will not interfere with game files managed by the repair tool.