How do I play black totally “legally”

I’ve really wanted to play gen 5 for a while now however I don’t have 200$ to drop on a game so if Yknow anyone has a way to play in a very “legal” manner that won’t leave my computer with 300 viruses that be appreciated (not required but really appreciated if it could also have no jerkmate or “Sally’s five miles away” adds that’d be great too)