The upstream versions of the Flash Player are on this page.
You can use release-monitoring.org to monitor this page the above page for new versions of the player via fedmsg.
Note that networking is disabled on security grounds. There are many security issues being discovered for the Adobe Flash web browser plugin on a regular basis, and we wouldn't want the stand-alone player to have any way to communicate to third-parties. You can work-around this yourself by launching the player with:
flatpak run --share=network com.adobe.Flash-Player-Projector