In Progress Crash on startup when opting into betas

[m33tballa]

Summary: Trying to launch any previous version of the game will immediately crash.
How to Reproduce: Opt in to previous versions on Steam
Have you used cheats and if so which: no
Scene Name (if related):
Media (Screenshots & Video):
Computer Specs:
OS: windows 10
GPU: geforce 1070
GPU Driver Version: current
CPU: i5 7700
RAM: 16gb
Motherboard:
Storage Device (HDD/SSD): ssd

 

[MArdA TaleWorlds]

We are aware of this issue and currently investigating it. There is however a workaround that is known to be fixing this issue.

Fix for the update breaking older versions:
This is caused by the language_data.xml files added in the update. If you remove them from Modules/CustomBattle/ModuleData/Languages/XX, Modules/SandBox/ModuleData/Languages/XX, and Modules/StoryMode/ModuleData/XX, it will work again. (XX means all language folders present)I recommend using command prompt:
(Insert your game path if different)
cd "C:\Program Files (x86)\Steam\steamapps\common\Mount & Blade II Bannerlord\Modules"
Press Enter
del language_data.xml /a /s
Press Enter
Done