TundraGibbon261 and Thugyiunis.
Have checked at my OneStore and found that I have all the files in TG261 a.m message BUT :
vcockpit instruments A 320 Neo
vcockpit instruments B747 8
Tryinf to find out if they are in any hidden file but have to check on process again since I forgot.
However in my : C:\Users\exogr\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\Content.xml I can see that one file is being 
Package active : FALSE i/o TRUE. (See attachement)
These 2 points could likely be the sources of (my) problems but ho to cope with it ?
