Firefox on win 10;
After admittedly too many downloads to count, I got the premium version. The best downloader, works on most websites and video players! Thanks!

Premium removes the watermark on those *o*tube videos!

Firefox on Linux(CachyOS);
The companion app unfortunately doesn't appear to work with linux or may simply be windows only and will only let you download videos up to 311MB. Unfortunately my premium is now useless - also, there is no place I can find to input my premium code - not sure if the app already knows I paid since I'm signed in my old firefox account.