So before you close this (like the others) I’d like to answer it myself: There is a solution but we won’t get it without paying.
Even though we got Premium with “Lifetime Updates” that miraculously does not mean “working Lifetime Updates”, so we’re stuck with a non-working version of this plugin because of an update. And – as others had this problem as well – the only way to fix this, is to pay you for the solution for a problem, that you created.
I guess we don’t have another option than paying you for your mistakes, but that’s just not how you get along with paying customers.