I think what happened is you must haven't fully understood the type of reset you chose. There are 3 different reset types:
- A complete reset, which will remove everything, Apps and personal files and documents.
- One that will keep your personal files, but will REMOVE APPS. Apps are not considered your personal files, because it's assumed you only need to reinstall their installer. This is what you likely have chosen.
- One that won't reset anything, it will just reinstall Windows but keeping APPS and your personal files intact. It's also called as "install in place"
That's not really a big issue, since all our installers for P3D are always freely available here, just download each installer for every product you have, and choose the same destination folder for the Addon Manager as before.