Social Engineering Install Error on Windows?

Just purchased the Social Engineering DLC for Windows through BMT. Went through the installation process, but receive the following error code when I try to run the game through the installer: “CreateProcess failed; Code 2. The system cannot find the file specified.” I’ve installed and uninstalled it several times, saving it in different places each time. I’ve also downloaded the latest base game patch for my system, and installed and uninstalled that a few times as well.

When I run the base game through it’s original application, my other mods (including Extremism) all show up, but Social Engineering doesn’t.

Please help? I’m loving this game and am really excited about the social engineering options!