Hello friends.
I see some people might have this issue after upgrading to 4.3 where the game asks for a Viking Conquest DLC serial key.
If you have this problem this is the solution to it, in the module folder of M&B's main directory, go inside the AWOIAF folder, there you'll find a .ini file named "Module", open that and change the "operation set value" line from 1170 to 1100.
Getting a serial key won't fix the issue this is the only way, tried and tested.
I see some people might have this issue after upgrading to 4.3 where the game asks for a Viking Conquest DLC serial key.
If you have this problem this is the solution to it, in the module folder of M&B's main directory, go inside the AWOIAF folder, there you'll find a .ini file named "Module", open that and change the "operation set value" line from 1170 to 1100.
Getting a serial key won't fix the issue this is the only way, tried and tested.