These steps finally works for me by using Terminal:
Remove Xcode (Removing /Application folder requires using sudo for root access):
sudo -s
rm -rf ~/Library/Developer/Xcode
rm -fr /Application/Xcode.app
Download Xcode from Apple:
https://developer.apple.com/download/more/?q=xcode
Download to a Removable Drive
or Move the file from Download Folder to the Removable Drive
I use a 32GB USB Flash Drive formatted with Mac OS Extended using Disk Utility
Extract and Install:
sudo -s
cd /Application
xip --expand /Volumes/<USB_DRIVE>/Xcode_<version>.xip
knoc
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