The easiest way to figure out where a game is writing its saves is to load it up in Sandboxie and save your game, then check sandboxie’s box content to see what got updated or saved and where.
Also, Cyberpunk is on GOG (because it’s made by the people who run GOG), there’s no need to get it through DODI unless you have a severely restricted internet connection and therefore desperately need the smaller size of a repack - you can get the clean gog installer from gog-games. You should just be able to install the latest GOG version over the old version with no difficulty.