IANAL, but my understanding is that you can generally keep using the previous version under MIT and any version that was still released under MIT; you just can'

IANAL, but my understanding is that you can generally keep using the previous version under MIT and any version that was still released under MIT; you just can't update past that to the non-MIT versions without falling into the new SaaS clause. That said, you should find out how much the payment is and see if you can just pay it; maybe you can negotiate a good deal with the author. They've gotta eat too, right?