So i reinstalled Bloodlines again through GOG Galaxy and was able to load my old save file. But when i enter the clinic in Santa Monica, the game always crashes with "Error: bad inline model number 77". I noticed a new version of the unofficial patch has been applied since my last time playing and read somewhere this may cause problems. Does this mean every time a new patch is released, my save files will become useless? What can i do?

Yes, if you have the Galaxy client set to automatically update your game. Which you can disable...

gog has a file repair button next to the game. it's what worked for me. fixed everything