Hi Graham, You might want to look at these kinds of articles:
How to install Catalina on older Mac, update macOS on an old MacBook https://www.macworld.co.uk/how-to/mac-software/install-catalina-old-mac-3654960/ Peter > On May 15, 2020, at 9:02 AM, Graham Samuel via use-livecode > <use-livecode@lists.runrev.com> wrote: > > As many of you will know, I have been struggling to create an iPhone app - > very unfamiliar territory for me. It’s been an education. Without help from > this list and the mother ship I would have been dead in the water long ago. > Finally I can see the (beta version of) the app running on my iPhones - > yipee! The next step is to get it out there via TestFlight so that a few > friends can mess with it. > > I just went through all the hoops with the Apple App Store to reach the magic > TestFlight stage, using the XCode Application Loader. Things looked good > until this: > >> ERROR ITMS-90725: "SDK Version Issue. This app was built with the iOS 12.1 >> SDK. New apps for iPhone or iPad must be built with the iOS 13 SDK or later.” > > My iMac can only run High Sierra, and High Sierra can only run XCode 10.1, > and AFAIK that version of XCode only runs SDK 12.1. I think that means I get > a new Mac or give up. > > Please tell me if I’m wrong. > > Graham > > PS I would really like a new Mac, but the budget is the problem! > _______________________________________________ > use-livecode mailing list > use-livecode@lists.runrev.com > Please visit this url to subscribe, unsubscribe and manage your subscription > preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
