This post can be for troubleshooting for now I guess. Here's how I solved the problem I had where the dev build wouldn't run after I finished wonloading it.
Here are some modding resourcesTurns out that Microsoft Visual Studio 2013 Isolated Shell redistributable package shipped with the tool requires Win XP SP 3 and thus can't be installed for Win 7. The solution is to download it manually.
Download Microsoft Visual Studio 2013 Shell (Isolated) Redistributable Package from Official Microsoft Download Center
Also, read XCOM 2 SDK\Documentation and install XCOM 2 SDK\Binaries\Redist\UE3Redist.exe package.
An Introduction to Xcom 2 Modding - YouTube
XCOM 2 mod development subreddit
XCOM 2 Mods