XCode For UE4 Installation

I’m sorry to say it, but probably get a new mac…

I have a Mac. I Want To Make a Game in UE4. But My Mac is Too Old. MacBook Air Early 2014. I’ve Other important Files. But When I Launch UE4 on My Mac, It says, ‘Can’t find Xcode install for Metal compiler. Please install Xcode and run Xcode.app to accept license or ensure active developer directory is set to current Xcode installation using xcode-select.’ Now My Mac is Too Old and It’s Has Too Low storage. I now You Guys Will say me To Download XCode From Mac App Store or official Website. But I Don’t Have Much Storage To Download XCode. Xcode Minimum Required Storage is 11 GB. But I’ve Only 4 GB Available. Now What I Need To Do Now?