From our side it looks like everything goes okay with downloading and fails just on extract. I need to build a new version of the NNC to get more information.
Fenix is a special case as it does not reside in the Community folder, the folder to check for permissions is C:\ProgramData\Fenix
If fixing permissions on that folder does not help either, a manual workaround until we can diagnose this proper is to unpack the 7z file mentioned in your error into C:\ProgramData\Fenix\Navdata
Kind regards,
Markus