This folder is rejected by Xplane 11 r 55 as there are issues with case sensitivity or data for Xplane 10 instead of Xplane 11 . I reloaded the 2607 and it is ok.
I just unpacked xplane11_native_2609.zip into …my X-Plane 11\Custom Data\, and loaded into the default Boeing 737-800 without error.
If still an issue, please show screenshots showing the issue using Guide to posting Screenshots.
Alternatively, update using the latest FMS Data Manager
Cheers
Ian