Another victim of ".SFS file is incompatible with this KSP version" here.
Long story short. Being me. Just common steam player. Steam updates games automatically. I dont even notice KSP get updated because i have a lot of active games. Load a save and play a little bit. Realize some mods don't work. Revert to previous version. Being a victim.
Yea i read now answers from dev team back from 2015 about making backups before updates. But after it happens to me.
Not even mad because im new on ksp and in my science save i was somewhere in mun landings, and making space stations in mun orbit so not far. But still... if i could chose i wish i can play on my previous save.
Like i wrote, dont need to reply to my post i read reaplies from 2015, just let you guys now, another victim.