6.3 is the latest update, which is the full game, but, did you move your renpy save folder to your external drive? as normally renpy store your saves to the folder %APPDATA%/RenPy/game_directory
If your saves were also deleted, then you would need to start over sorry, but, if you need a save file, just let me know what path you are on with Triss being pregnant or not and if you had Sophie & Eve love points maxed out? and I will send a save file for you
Or, if you ended your last save at the ending of 5.3, then I can send you the save for up till then.