It may be because the test map is packaged for 4.09 modded game
If your running 4.10 and UP 3.0 or DBW it would need to be taken apart and installed by hand
Basically,in UP 3.0
You just need the map folder,place it in
IL-2?#UP#/MapMods
or...
IL-2/#UP#/STD/maps
which ever folder structure you like,search for your all.ini in either of those two locations
and add the required all.ini info
how to create your own all.ini info>
Right clicking on the map folder and copying the folders name then,pasting it into the all.ini then hitting space bar once and pasting the name again then/load.ini
example>
Guadal_Testmap Guadal_Testmap/load.ini
First name can be anything
MyGuadal_Testmap Guadal_testmap/load.ini
second name after once space needs to be the name of the map folder
/load.ini tells the game which load.ini to load
In the above example,once in the FMB
you would see MyGuadal_Tesmap

Just dissect the download,
and use just the map folder to install into whatever kind of Modded game you are running
I just did it,and the map runs fine in UP 3.0