I think my game crashed and now when I load my save file, it loads a newer version of the game. A lot of my factory is now broken because of this. How do I revert back to the previous version the save file was using?

I quit factorio this morning and the next time I opened up my save file, a lot of things were different. It seems the game was updated. Things like the boiler changed and I had to redesign how my power works. Also, some recipes changed (such as for science pack 3) and now my factory doesnt really ...