homebrewsoftware-updatexcode
During parallel downloading Xcode and installing homebrew, I stopped installing Command Line Tools for Xcode. Now I can see in Software Update two items related to that. With different versions. After clicking Update Now I can see a progress bar. But finally, the message doesn't go and it proposes me update that 2 items again.
It may help to manually remove the Launchpad databases from your home directory. The databases should be located at ~/Library/Application Support/Dock...The files may have UUID names (long string of hex chars)...Removing those files, performing a logout/login (or a reboot) should allow those files to be rebuilt from the exiting applications in /Applications.
You can get into the Library folder by holding down the "Option" key on the keyboard, clicking on the "Go" menu (when you're in the Finder), and choosing "Library".
As a workaround, you can download it directly from Downloads for Apple Developers if you have a (free or paid) account.
Update: At one time the included link above would take one directly to Downloads for Apple Developers after signing in, however as time goes by things change. So once logged into your Developer account add downloads to the address in the address bar so it shows as https://developer.apple.com/downloads and then press enter.
You should then be at the Downloads for Apple Developers section as shown in the cropped clip below.
Best Answer
I recommend to download the Command Line Tools 11.2 from More Downloads for Apple Developers. An Apple ID is required.
Install it manually and afterwards the pending (and obviously not installing) updates in Software Update will vanish.
As an alternative a direct d/l link: Command Line Tools 11.2