Bought Napoleonic Wars on GamersGate, can't install it

So I bought Napoleonic Wars on GamersGate today and got it downloaded, however, I couldn't install it. It says that "Mount & Blade: Warband has not been installed on this computer." And then it tells me to download the full installer from this site.
I have installed M&B: Warband on my computer, I bought it from Desura and it's installed, working correctly.

It doesn't let me choose where to install M&B: NW neither, so that makes this a whole lot harder.
So I'd really appreciate it if I could get some help with this problem.

Install this:
http://download.taleworlds.com/mb_warband_setup_1153.exe

Then this:
http://download.taleworlds.com/mb_warband_napoleonic_wars_setup_1006.exe

Thank you 

i still cant install the latest patch   pls help

Abdito said:

i still cant install the latest patch   pls help

Click to expand...

Wew, you're waking up pretty old thread there.

M&B Warband 1.158
Napoleonic Wars 1.104