It is okay to use a PopCap version of plants vs zombies?

As long as the game is still up to date it should be fine for run submissions. PopCap is still the original developer of the game after all.

What version are you using for it to not be the Popcap version lol, it should be a popcap version unless your using a mod or something.

If it's the older ones, it'll be at "Legacy" version if verified.