the feature you are trying to use is on a network resource that is unavailable

If you get the error, "the feature you are trying to use is on a network resource that is unavailable" when you try to uninstall the add-in go to https://support.microsoft.com/en-us/topic/fix-problems-that-block-programs-from-being-installed-or-removed-cca7d1b6-65a9-3d98-426b-e9f927e1eb4d and

Download troubleshooter

then select Problem Uninstalling and remove the Calcbench Excel Add-in