I have a pop up saying "djay is damaged and cant open

Sounds like you should delete and re-install.

Hey Marcos, 

thank you very much for contacting us!

Yeah, there was a problem with the App Store, if your version isn’t available please send a private mail to our support team: http://help.algoriddim.com/customer/portal/emails/new

We are happy to help you!

Best regards, Alex

this is what apple wants you to do. the real problem is: there is now only a pro version available - and you have to pay.