Muse is not officially supported by Extension Manager so it will not be shown in the left panel of Exension Manager CC. But if you are sure the file is a ZXP file, you can install it with Extension Manager CC. If everything is OK, the extension will be installed to your download folder (I am not very sure) and shown in "Others" category of Extension Manager CC. I guess it is a .Muse file, then you can copy it somewhere else or open it directly in Muse.
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