Fix order
- Exit and restart Steam.
- Verify Wallpaper Engine files in Steam properties.
- Restart Windows after pending updates.
- Temporarily test without overlays or conflicting desktop tools.
- Review antivirus quarantine and allow the official installation if it was blocked.
Preserve your library
Do not manually delete Workshop folders as a first troubleshooting step. Steam verification is safer.
Get official help
For persistent crashes, use the official troubleshooting and log-sharing instructions rather than random registry cleaners.