AFTER AUG 2, 2024 PATCH:
The update to Unreal Engine 4.26.2 and SteamCore sessions required the changing of the SaveGames folder location. This is also to allow Steam Cloud Sync to work properly.

If your old game data is critical, to keep it is a simple copy and paste from one location to another.

MOVING SAVED DATA:
Copy all .sav files from:
\Users\{your user}\AppData\Local\BudsLaboratory\Saved\SaveGames
to
\{YouSteamLibraryLocation}\steamapps\common\Bud Masters\WindowsNoEditor\BudsLaboratory\Saved\SaveGames