The game has been completely completed, all the classic levels, toys, weapons, drones, Praetorian tokens, secrets have been found, runic tests and level challenges have been completed. All runes have been improved, all weapons have been maxed out, and the master tests for each modification have been passed. I played on a repack from xatab version 6.66 Update 8.
Launch the game at least once, and then make sure that the directory along the path C:\Users\(username)\Saved Games\id Software\DOOM\base\savegame.user\ contains a folder called 76561197960267366.
If the folder has a different number, This means that the version of the game/repack is different and the saves will not be read.
Unpack the contents of the archive here: C:\Users\(username)\Saved Games\id Software\DOOM.