Aircraft

Extract the archive into the folder containing combatfs.exe with 'use folder names' option on:

This should create an aircraft folder:
(*CFS*\Aircraft\*Aircraft Name*\)
containing model/panel/sound/texture subfolders as well as the .cfg file, .air file and .dp file:

Run CFS and goto Freeflight then select the aircraft from the menu:

Some planes may not appear as they are AI models and controlled only by the computer.

Scenery

You can copy all the .bgl files to the general CFS scenery folder (*CFS*\Scenery\All\Scenery\) but this is the recommended way:

Create a new folder ("Norway") in the CFS scenery folder and create a subfolder ("Scenery") inside this. Copy all the .bgl files to this new "Scenery" sub-folder.
Extracting the archive into the folder containing combatfs.exe with 'use folder names' option on will do the above automatically:

Run CFS go to Freeflight and select "Scenery Library" from the "World" menu
Select "Files" then "Add" and fill in as follows:

=:\=\scenery\Norway\scenery\*.bgl
Norway
Local
Check the "Scenery Area Active" box then OK for everything to close the dialogs and the scenery will be installed.