Having both Sims 3 and Sims 4 installed on the same computer?

I read somewhere ( I can't recall where it was) that it would cause bugs or problems with the games working if you had both installed at the same time on the same computer, and I had recently removed Sims 4 because I was having so many bugs ( no mods either) and have been playing the Sims 3. I want to be able to try to see if another repair would make the other one work again ( still constantly trying even tho it has been annoying) but wanted to be sure if that was right or not. Any advice is helpful , thanks so much.