I've been using the Jammit app for learning songs and it's now not supported as the company that made it has gone bust. I've got a lot of tracks I've brought from them and they're still on my hard drive.....

I found a site <https://github.com/mtolly/jammittools> and it seems to have a solution which would do everything I need it to (extract the audio and score files for me to use outside of the app) but I have come up against a problem! I just don't understand how to use the software! As it's not for distribution to others but solely for my use, I'm just after getting the things back that I've paid for but can no longer access.....

I'm running an iMac 21.5 inch, Mid 2010, macOS Sierra v. 10.12.1

I've managed to get so that some of the command lines work, but I cannot locate the files within the Jammit app.......