PMDG 737 airac update

try to update airac with Navigraph Navdata Center and get this message.



EPERM means that the application cannot access something because of lacking privileges. Have you installed into default locations?

Does a computer restart help?


I tried a restart of the computer and it does the same thing. The installer didn’t ask me to install it any where else it did an automatic install


Same problem here, can’t update PMDG 737, reboot didn’t change anything, I can update Navigraph chart + Airac.

I also have the same problem.
Is there any option to start the Navdata Center in verbose mode to see what is trying to access and it’s failing due to permissions problems?

Please advise.

Hector B.


For me I had to change the permissions for “users” group to “FULL” permissions to the folder: “pmdg-aircraft-737”
I have the MS Store version of FS2020 installed here:
D:\Program Files\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\Packages\Community

  1. Right click on the “pmdg-aircraft-737” folder
    2, Click on the “Security” tab
  2. Under Group or user names. select “Users”
  3. Click on “Edit”
  4. On the new popup window, select once again: “Users”
  5. Under Permissions for Users: Click checkmark box Allow: Full Control
  6. Click “OK”
  7. Click “OK” once again.

This fixes the permissions the “pmdg-aircraft-737” installation folder.
Rerun Navigraph NavData Center, and try to update the PMDG add-on package.

Hector B.


1 Like

Hi Ian,
I have MSFS installed outside of (C)Drive onto (F)Drive and I get a message saying no sim detected although when I fly I see my airplane on the charts map. I’m as well trying to update airac on PMDG 737 any help would be appreciated

I fixed it by redirecting the directory in the installer to


Again my MSFS is not installed on my C drive and the default directory did not work, so redirecting the installer to LocalState worked for me.

good luck with yours


You are a lifesaver. This was driving me nuts! Thanks for the fix.
Have a great day!

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