Am I able to delete old versions of the game when I download the newest versions? Im just worried I will lose my saves if I delete older versions of the game

the save file should be in the game folder just copy that n place it in the new version 

I'd be surprised if what Cyther said is even needed, though I can't be 100% sure. It should detect your saves if it's on the same PC, regardless of copy/pasting files. You could apply Cyther's suggestion if you want to be safe.