I just paid for the version that supports J5 however there are a couple bugs that make it difficult to use.

1. The payment automation from Stripe or PayPal no longer marks the invoice as paid even though the funds are transferred. The system doesn't send an email informing me of the payment. I've had to unpublish these methods so as to not receive payment warning from PayPal.
2. Saving a payment doesn't work. The page either does nothing or closes - but the payment is not saved. This happens when first editing a new payment or trying to mark it as paid. The only way to mark it as paid is through the edit invoice screen

I've been using IM for many years and had neither of these issues on J3 or J4, they only appreaed in the J5 version.