I just installed Sonoma Beta 3 and was able to 1) Open QB 2019 2) Add a customer 3) Create the invoice and 4) Mark the invoice paid. It seems to be working (thankfully). It's a shame that Apple took care of this with their update, and that Intuit was happy to leave us high and dry. I am going to use this opportunity to get everything in order and then migrate to a new software. There will be a learning curve for sure, but Intuit handled this really poorly and gave NO guidance.