These are paid apps. You will NOT need to purchase these in the Google Play Store. There is nothing to do after installing them. Make sure you watch the video if you're not sure what your doing. Obviously the Dark Magic (XXX) is for Adults only.

Make sure you allow install from unknown sources. I use these myself on my Google Pixel 2 XL, running Android 10, and don't have any issues. If you're looking for something specific, let me know. This is hardly all of the software I have.

The free version of Plex from the Play Store will only allow 1 min of video to be paid.

This one will allow continus Playback!