Ever heard of a computers ´´appdata``? Your saves are safe in there. Just delete the old version, download the new one and just continue your save. You are playing on PC and not on Android or Mac for instance?
Like i said... IF you play on PC, you just delete the old version and download the new one, your saves are safe in the appdata. Thats just computer science! And how the f were i ´´half correct``? I only siad about *1* thing.