I: Ran "Delete Generated Files.lnk" as administrator Uninstalled the Client Deleted c:\ProgramData\Lockheed Martin Deleted (moved away) c:\...\Documents\Prepar3D v4 Add-ons (BVAI, EDDL, FSDT Addon Manager, FSDT KCTL, FSLabs, Male International Airport, MWCR2016, NY Airports v2 X, Orbx Obje...

Tried. As written and also all steps together without intermediate runs of P3D (only at the end).
No difference. Stuck at 98% of "Generating scenery file indexes...", no questions/prompts before that.
Ran as administrator.

Just to confirm. Did you delete the ProgramData folder Or the Lockheed Martin folder ? Lockheed Martin folder inside ProgramData. c:\ProgramData\ Lockheed Martin . Not (all of) c:\ProgramData. I thought I was deleting backups of stuff I no longer need, but still had stuff in ProgramData (backups) I...

I already tried the equivalent thing. I renamed both folders in Documents to:

• Prepar3D v4 Add-ons.original
• Prepar3D v4 Files.original

New folders were (re)created but P3D didn't start.

After being reminded by you that I can do that, I just did. It didn't help :(

I was deleting some very old and deleted backups I unknowingly deleted c:\ProgramData\Lockheed Martin when I thought I deleted "...backup\Users\All Users\Lockheed Martin"- the path shown to me was not on C:\ but it was a link and the data was gone. No recycle bin help - I efficiently delet...