I have tried all that, my folder is E:\X-Plane 11, on my second drive. I wonder why I can install a new X-PLANE 11 without problems, files are written to the same locations, and the new install does not complain and functions without problems.
The downloaded version, from Laminar not Steam, is v11 and runs fine, so the updates is not that important, but I like to have my programs up to date.
I am logged in as adminstrator and the update program is set to administrator in the compatibility setting. The user\sejr6\appdata\local folder is open for all users.
Will have to wait for the next update and try again, my bug report got the same advice as you kindly gives me, and on my pc that dose not do the trick.
Thanks for your answer.