I'm using Mac 10.15 with Xcode 12.4 and my IOS is 15. I dont want to update my catalina os at all. Could i just download the IOS 15 folder and install it to my xcode?
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You don't need to update your Mac with Catalina OS. You simply add device support files for iOS 15 into Xcode.

Protocol
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if you don't know how to add device support files then have a look https://stackoverflow.com/a/58075799/8259188 – Protocol Dec 09 '21 at 05:00