1) create folder "Scenarios", put her in ...THQ/company of heroes/ww2/data/
2) extract "mp" in the folder : .....THQ/Company of Heroes/WW2/Data/Scenarios
3) -create a new short cut to coh on your desktop
-right click the shortcut and click properties
-in the tarket box add a space then type -dev after the brackets so it reads
".......Company of HeroesRelicCOH.exe" -dev
-you have to have the space between the brackets and the -dev or it wont work!
(excuses my approximate English)