I noticed if you activate the trainer when manually playing a battle part of it tends to work. the activation will work, as will the instant power recharge, infinite magic and infinite ammo. Godmode mostly works with some heroes and the casket of souls not getting the increased health as far as I have noticed.
When activated in a battle, generally the trainer will more or less work with most options that I use though it can still decide to crash. I suppose this work-around could be somewhat of a help for the time until it can fix, and I hope the information I provided with this partial work around can help with a fix.
I do advice to still save the game before trainer activation or before deciding to activate a new function, just in case it might still crash, as I believe the trainer does still provide instability.