X2PRO "broken"after update on Mojave. Need to buy it again!

There should never be a reason for you to buy an app from the Appstore multiple times (I don't think its possible on the same account).
Make sure you are definitely logged into the same Appstore account that bought X2Pro. If so, you should just be able to download the app again.

If you're unable to what error messages are you getting from X2Pro?

Hi! I have a huge issue with X2PRO 4.4.1. since I updated my Mac on Mojave, it says it's broken and I'm supposed to buy it again!!!! I paid 150$ for it and used it 3 times only ( the last time it did work). I refuse to pay again for a bug. What do you propose? It's quite urgent I have a deadline on November the 15th. Thank you