Hey Boomer I tired to load these maps in the new 4.12.2 plus mod act 5.3.
The western front map will load but not the Somme.
This new map version uses HD skins and stuff, so if the 4.12 game version is not using the HD-Mod by Carsmater,
then this will not work.
But there might be a solution, there is another version of this map with normal resolution skins. It was the first version posted
a few years ago.
Look at the post ... this package has 2 map versions... 2048 HD and 1024.
That 1024 map (should) work with any game and to my eyes is just perfect.
Nicely detailed landscape and amazing looking "No Mans Land" territory along the whole map were the fighting took place.
(It is very realistic looking! No other WW1 flight-sim has this realistic map! - NOT even the RoF game! ) ,
with many bomb craters and realistic WW1 looking trenches.
Both maps look almost the same, but have slightly different variations to some hills and countryside, the HD version
has a few extra added details (Hey, its in "High Definiton" ) , but they both should be installed in any game for the BEST flying experience in WW1.