Welcome to the forum.
The version reference (1015.7) you give is a bit bizarre. And you likely misread it.
You probably have Catalina which is 10.15.7 (the latest MacOS 10 version). But it is much older than MacOS 14.
Hence the message you get is logical.
Which Mac have you got, to see if it can support MacOS 14 ?
Topic:
Developer Tools & Services
SubTopic:
Xcode
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