Should be fixed in v9.2.1, assuming the error on loading was about assembler 3 pipe pictures (with Fluids as Fluids setting enabled)
Also glad to hear it you've been enjoying the mod, this is also one of my personal favorites! Unfortunate about the donation thing; in the US, there are two alternative methods shown (venmo and debit/credit card) in addition to Paypal, but I suppose that might not be the case outside of the US. The only other donation alternative I know of is Patreon, but I imagine that would fall under the same requirements/restrictions