X11.1 does not install with Catalina

Which error ?

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Or just use your words...

Might want to search for/read recent threads same topic: such asUnable to install Xcode 11.1

Is this about not enough free space? If so, there are recent threads that cover that topic, such as: https://forums.developer.apple.com/message/338540#338540

Did you already have luck installing Xcode 11.0?