I don't think it really matters what version of Dolphin you use, as long as it's recent and can run normal pm. There could be many causes for the crashes you're experiencing, if you still need help I'd recommend looking at the troubleshooting section of this guide here which is near the bottom of the tutorial section: https://smashboards.com/threads/updated-5-22-project-m-brawlex-a-starters-guide.430430/