My 25 hours save isnt working anymore. Everytime i want to load it, the game just shut down without any error. Is this a known issue and is there a way to get my save back?
It's a known error but not one with a reliable fix, or anything I can do about it. It's just a hazard of a code heavy game being this large and continuing development for this long.
Step one is to try loading an autosave. You might lose a tiny sliver of progress, but it could save your file right now, with no extra effort.
After that it's making sure you've got a clean install.
Beyond that the next easiest thing is to restart and use the cheats to get you back to where you were. Not a great option... but it is an option.
Finally if you send me your save file I can try to repair it. A lot of the time just loading it in a different computer can solve the problem, but there's no guarantees.