Welcome.

thx for the info Gunter

Use IFA3 Lite instead as it is a full mod, the files you will download are for the "Full" version of IFA3, its not the current IFA3 lite with high rez textures, its your Iron front game converted to a mod for arma3.

Please note that in order to use this you must own the game:
Iron front: Liberation 1944
yes the game, because the link above---> Conversion IronFrontArmaConversion
is a tool you run to convert the game to a mod, my mod team in 2013 created this, with Kju.
kju done away with this conversion process in late 2015 because it worked half the time.
If the conversion process did work, and you ran IFA3 as suggested above, yes you would get high resolution textures ect,. but it probably would not work with current IFA3 lite as IFA3 lite uses new classnames, has more content now, new maps, and Invasion 1944 in it too.
This is not supported anymore, use IFA3 Lite.