Are the new ones going to be available as unencrypted windowblinds like Gloss Burgundy was?
In WinCustomize, click on "Settings" in upper right (right below the search window). Click on "Registrations" tab in upper right. Find the three "MyColors Gloss" listings. Download and save zip from 2nd link in each listing. Those show up in theme manager as non-MyColors themes (at least Grey and Mint do, didn't do Burgundy that way).