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If you have Microsoft Office installed, you most likely have a hidden folder on your C: drive called MSOCache. This is used to facilitate repairs and reinstallations of Microsoft Office features but it can eat up a lot of disk space. When you are on a crash diet you might have to live without it. It won't affect running any Office applications, but attempts to install new features will fail.
You may safely delete MSOCache folder with no regrets in case you have installation media you may use later in case it is required.
or just copy the .CSC file to the Scripts folder of Cleanmgr+