Installing mod help

[downtown]

I am one of the people who never played CCIII before I bought Cross of Iron, so please bear with me. I am enjoying playing single battles to get familiar with the game style, and I am ready to get more into the game.
I just downloaded the DerOstFront2 mod from the CloseCombat.org website, unzipped it to the plugin folder as instructed. When I tried to install it using ModSwap I received the following error:
"This mod requires exclusive use of the file cc3.exe, which has already been modified by a previously installed mod."
I did previously install the Grosdeutschland mod, which is working fine. My question is, how do I move between mods. If I want to play DerOstFront2, what do I need to do to make it happen? How do you play one mod after playing another? Did I miss something? I have not read all the documentation because I really wanted to get right into it, so if there is a place I should look in the docs, please direct me?

[downtown]

Nevermind, I figured it out. I just used uninstall Grosdeutschland in ModSwap and installed DerOstFront2 and it seemed to work. Now I am downloading the maps for DerOstFront2, then I will install them and the fight will be on!

[Andrew Williams]

You got it.
 
Uninstall any mods you have before installing a new mod.
 
 
****** Unless you are told to install another mod first.