I don’t know why it did, but if this happens you can use 7zip to extract “source” file.
Then do a manual install.
Extract the “source” with 7zip and move the main folder “Add-On Nordic” into the folder …\Falcon BMS 4.33 U1\Data. It will be exactly like this: …\Falcon BMS 4.33 U1\Data\Add-On Nordic.
Open your “Windows Explorer” and browse to this folder: …\Falcon BMS 4.33 U1\Data\Terrdata\theaterdefinition.
Inside this folder (means into “theaterdefinition”) there is a file named “theater.lst”. Right click on it and choose “Open with…” and then click on “Notepad” and to “OK”.
Now add exactly these lines as the last ones:
Add-On Nordic\Terrdata\theaterdefinition\NordicCWC.tdf
Add-On Nordic\Terrdata\theaterdefinition\Nordic.tdf
From the menu of the “Notepad” click to “File” and then to “Save”. Then close “Notepad”.
3) You can now run the simulator and from the menu “THEATER” choose the “Nordic” or “cold war” and hit to “OK”.
Exit and restart the simulator and you are ready.