Hello
I will assume your use case still complies with the iOS SDK EULA (for example, let's say you own a Mac, but it's either too old or broken and you use it "differently").
Please see here: https://www.pmbaty.com/iosbuildenv/help/thread.php?path=Problem%20solving/&file=can-t-use-your-mac-to-extract-the-ios-sdk
Have a nice day,