I have a mid (2012) Mac Pro and I have been trying everything to upgrade just to High Sierra and can't seem to do it. I've tried everything I can think of. Anyone have any ideas?
I've tried to go to the app store to get a download of high sierra and somehow did, but when i tried to open it there was an error message that it was a corrupted file or something was wrong with it. Then i tried to delete what I downloaded and look for it again in the app store and now I can't even access it in the app store. There's always an error message when looking for high sierra. Anyone have any idea how i can upgrade this? I did this all because i want to upgrade my garage band, but it needs a version greater than 10.13. Currently sierra is only 10.12.6