10.10.5. I'm trying to open a project from someone else done on her garageband. I'm trying to open it on my Mac, in my garageband. I don't use GB so it's in need of updating. I go to app store. No updating options but I can GET it again. I click install and put in my password. It doesn't work. I'm given a code on my iPhone. The dialogue says to enter my password again followed by the new access code. I've done this repeatedly last night and today, in different ways. It doesn't work. What am I doing wrong? What do I need to do? Delete GB?