Try this ,
WARNING : Altering ww2Art.sga and relicCOH.module files doesn't prevent to play online, but prevents to make a game update so it's necessary to save the genuine files and put them back before any patching.Phase one
: Unpack used archives (http://modstudio.corsix.org/
•Select load single sga archive
•Select "THQ\Company of Heroes\WW2\Archives\ww2Art.sga"
•On the left, top window, an "data" folder appears. Right click on it and select "extract all files in this folder", then "go!"
•Choose where to extract folder... Create a new folder where you have space enough, call it "myWW2" then 'OK'. You will see the extraction in progress. Then close Corsix. or \Program Files\THQ\Company Of Heroes\Eastern_Front\Data\artPhase two
: Insert Skin pack files in 'myWW2Art' or \Program Files\THQ\Company Of Heroes\Eastern_Front\Data\art
•Copy the files in ww2/Data/art from the mod .zip file
•Paste it in 'myWW2' \Program Files\THQ\Company Of Heroes\Eastern_Front\Data\art, the one you've created. You will be ask to overwrite existing files. You have to answer yes.Phase three
: repack ww2Art.sga
•Open Corsix again
•Open an sga archive (or open or create a mod)... this steps just allow you to access some options of Corsix.
•On the top left menu bar, select 'MOD', 'SGA Packer'
•In the Input directory, browse to 'myWW2' or \Program Files\THQ\Company Of Heroes\Eastern_Front\Data\art directory
•In the SGA to create browse to 'THQ\Company of Heroes\WW2\Archives\ww2Art.sga' then click 'Create'.
•This process might take few minutes.Phase four
: Modify relicCOH.module
•Edit the RelicCOH.module file with notepad and modify the following part that way:
Genuine file :
archive.01 = WW2\Archives\AttribArchive
Modified file :
archive.01 = WW2\Archives\Attrib***
archive.02 = WW2\Archives\AttribArchive
***the name of your mod . This is already present in the EF module file , So no changes required there, if you are using the EF folder.Phase five