I had no issue utilizing the MS store to download it. It runs fine. I then proceeded to go to the win apps folder, took control over the main cinebench folder and now have a standalone cinebench 20. I then uninstalled it so I no longer have an entry in the start menu.
Looking at things now, it appears that releasing a standalone download for Cinebench R20 was always Maxon's intention, stating in emails from enthusiasts (thanks Skeggz) that a standalone download was coming. As stated above, Windows 7 support for the benchmark was planned, which means that a standalone version of the app was always on the cards.
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After annoying everyone and hurting their brand with issuing legal notices to sites to take down a standalone version made from the M$ store download. If it was the plan all along it would have launched same day or sooner than the much harder to do M$ store launch.