I have problems downloading the mod. It get the message "error installing mod" message. I have tried unsuscribing my mods in the workshop and deleting the workshop folder but without success. Then I reinstalled the game after going through the same procedure. When accessing the mod through the menu it shows up as "unavaible". Anybody knows what causes this?

"If this problem does happen to you and you can't download a mod, have someone with a working version of the mod go to their Appdata folder and zip up the particular mod folder you need and unzip and replace in the appropriate place on your system. You can go to the Appdata folder by pressing the windows key and R. That will bring up a Run prompt. Open %appdata% and go to your Natural Selection 2/Workshop folder."

Source: Main page

And you can use my compmod folder for it and maybe perhaps this works it worked for a couple of people.
Link: https://www.dropbox.com/s/ut91u2x42gttj6h/me5ffa15_1418953063.rar?dl=0

just download my folder of the mod place it on your Workshop folder in there and it should work, if not well gotta wait for until 3rd of January when the Steam sale is finally over and maybe the Workshop returns to a stable stage.