![]() My MacPro 3.1 (2008) is running Sierra, and works very well. ![]() You only have 4GBs RAM according to your profile, this is really the bare minimum required by the OS so it may drag aīit, upgrading is an option if you want, but as it is an oldie, is it worth it. I would advise installing it to an external drive, you should also check that any third party apps you are using are supported or have updates for Sierra, check here: also check whether any peripherals (printers, scanners, etc) are supported in Sierra, check with the manufacturer. On the supported mac download Sierra, and before it starts the installation look in the Applications folder for Install macOSSierra.app and copy it to a USB stick, or send via network to your old iMac. ![]() You will need a copy of Sierra before you start, as your iMac is too old it won't let you download it so you will have to use another mac that is supported to do this. Developers do not have to use the latest version of Xcode to develop and publish apps to the Mac or iOS App Stores. This insanity started with version 13, which Apple rapidly replace with version 14. This highlights the crux of the assumption in your question - that you need the latest version of Xcode to develop and publish apps. And now for my diatribe: Apple literally destroyed my interest in using Safari thanks to them destroying its available EXTENSIONS. Please make a backup of your current system prior to attempting this. Actually, v14.0.3 is the current version. So if you look at this, 977128/ and follow the instructions from dosdude1 and foxlet you should be able to get Sierra running on your mac.
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