I got ransomeware from this, so be warned.

I was on Youtube, trying to download a Kingdom Hearts cutscene video, and whilst it was downloading the 1080p version (which uses the companion app), my anti-virus started popping up messages saying "Threat detected, no action required". At first only 1-2 ever 10 seconds, than about 1 every second, until it finished downloading the video.

Once done, I navigated to the folder where the video was downloaded, and all of a sudden ALL the files in the folder turned into "DOCM" files and a text file appeared giving me instructions on how to retrieve my files by sending money through TOR using crypto currency.

I checked 3 other folders, wherein all files turned into DOCM files, and then immediately shut off the computer. I had to completely reformat C Drive, and reinstall Windows and everything from scratch to kill the ransomeware.

Thankfully most of my files which were not on C drive were saved due to shutting the PC of quickly, but just BE AWARE! I was not doing anything whilst downloading the Kingdom Hearts cutscene video. I was not browsing another site, and I was not downloading anything else.

So the companion app for this add-on more than likely contains ransomeware!