If you are having trouble launching the modding tools:
1) Make sure the modding kit and base game are installed in the same drive.
2) Make sure your base game is on version 1.5.2 (tools and base game must be on the same version - currently 1.5.2)
3) Make sure you don't have any mods installed
4) Make sure you install Microsoft Visual C++ 2013 Redistributable x64
docs.modding.bannerlord.com
If all that fails to resolve your problem, you need to post a bug report here:
https://forums.taleworlds.com/index.php?forums/bug-crash-reports.784/