I used windows recovery and went back to a previous version of windows 10. Had to reinstall Plex. Now the new version of Plex does not recognize my old version and all my libraries, dvr, etc. are missing. How do I recover?
Some Plex settings are saved in your Windows registry. If you restored a previous version of Windows, that version may not have the registry info.
Plex’s setup is also saved under your user’s local appdata folder. I don’t know if your restore also “restored” that to a previous state. If so, then everything is gone and you may need to start over.
The main thing to check for is the Plex database file. See https://support.plex.tv/articles/202485658-restore-a-database-backed-up-via-scheduled-tasks/ for where to look. If you don’t have the database file, you’ll have to start over.
it’s too bad that plex doesn’t backup the preferences.xml and registry settings, in the automated backup.
also, its too bad that plex doesn’t use preferences.xml for ALL servers.
Its kind of silly to use registry on windows and preferences.xml elsewhere.
To be fair, it’s only Linux systems that use preferences. Windows PMS came first and it is normal Windows practice to use the registry. Just like PMS Mac uses their plist file which is normal for Max. And Windows is still the majority OS (by a large margin) used for PMS. So statistically, we should be using the registry everywhere. 
ideally, on a cross platform app, preferences should be stored equally across all systems.
this reduces code, provides consistent behavior/location, and causes less confusion.
I further state that most preferences should be stored in the database, and only non-portable/system specific settings should be stored in a preferences.xml/registry.
albeit preferences.xml allows for easier user editing/viewing.
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