Hi there, hope somebody can help me here.

I've had iReal Pro running on a Macbook since 2014, and for some reason today it has decided to lock me out and says I must enter my Apple ID password to access the app. This has never happened before, I've never had to log into it to use it, it would just load on selecting the booting icon. But the real problem is, it won't load even when I enter the password. I don't know what's going on, but I suspect it may be that the Macbook is coming to the end of its reliable life and maybe I should just get my practise tunes etc out of it before it's too late. Which is what I need help with. Where do I find them on the Mac? How do I get them if I can't load the app to export them?

Hope somebody can help.
Grant