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.
Remember the golden rule of statistics: A personal sample size of one is a sufficient basis upon which to draw universal conclusions.
Upload the computer to Dropbox and provide a link to it so others may download it to examine and give advice for repairs.
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.