I need to correct myself.
The pocketmags reader DOES work with W8 and 10. It is the W7 version that has been withdrawn. By my estimate they had less than 0.1 reader per title using it.
We don't actively promote the windows version because so many of our readers use W7 and XP and this was creating too many problems.
If you want it you need to get it from Microsoft Store.
This is no different from having to get the other platform's versions from Apple Store or Google Play.
Neil