Well, thats seems to be an easy one
Between V2x versions you can import save games _if they are from the safe zone_, which is the DAY X nightly screen with the banner on it and the little icon.
What to do:
- save your V200_010d game on such a screen
- install V205_xxx in a _fresh folder_ as usual (NEVER EVER overinstall into an old one)
- load your saved game and an import / migration code piece kicks off automatically and updates your game
- continue playing
- and most important of all: DO NOT USE ANY MODS OR URM
Normally you should get this info when trying to load an incompatible save.
Not sure what happened there but if you stick to above procedure it works
If you already deleted V200_010d you can get it on itch io.