Hello,
Here is a really big catastrophe.
After updating my Rotate MD-80 using X-Updater, I started X-Plane and a message told that I should update X-Plane from the installation page. So I did it (without asking for the beta version) and then I flew with MD-80, without looking at where my other planes were.

Then I wanted to fly with my ZIBO 737-800, but I discovered that all my planes, purchased and freeware, were gone.

I quit and relaunched X-Plane, but the problem persists.
Yet my aircrafts folders were all still in the Aircraft file of X-Plane.
Yes, except… that on closer inspection, I realize that the aircraft files were there, but all empty!
Same for all my sceneries!

Possible explanation:
When I launched X-Updater, I had to “browse the folder” and I thought I had to indicate the main X-Plane folder.
It was then that a "verification" window indicated to me "zero files".

Did X-Updater emptied all my files?

Main question:

Is it possible to reverse or do I have to reinstall my hundreds of stages and planes?
Otherwise, what can I do?
Do you understand what happened?

Thanks for your help, I'm desperate.
And thank you again.