Right-click the game in your library, go to Manage > Browse local files . Look for u4.exe in the root folder.
This will scan your folder and download only the missing u4.exe without wiping your save data. Why does this happen? u4.exe does not exist
If you are trying to launch a program—most commonly associated with the classic RPG Ultima IV or certain specialized software utilities—and you are greeted with the frustrating or "File not found" error, you aren't alone. Right-click the game in your library, go to