I have used a G-Force M-Tron Pro (plug-in mellotron instrument) for about eight years. It's been installed in my current iMac using OS Catalina since I bought it a couple of years ago but I really haven't used it much if at all with this computer. It does work on it's own (stand alone?) because I have tried that. I also have it installed in my older iMac with a pretty old OS (Tiger? Leopard?) that I use in my music studio where it works fine as a stand alone instrument or w/Garageband. So, that's the background. Now I want to use my newer computer in my studio but I am finding that Garageband and M-Tron Pro are not wanting to work together with the newer OS. The Garageband app crashes when I try to use it as a plug-in. G-Force has a website w/ installer upgrades. I downloaded these upgrades and they are sitting in my downloads file. I am not a computer person. Am I suppose to now place them somewhere? If so, how and where? Also, will this even solve my problem? Thanks in advance for any help you may give.