Hello, I guess you're getting a "Napoleonic Wars not found" error. So what you've got to do is:
Press Windows + R
Type regedit
Head to HKCU - HKEY Current user
Open the software folder
Head to MountAndBladeWarbandKeys
Right click on MoutnAndBladeWarbandKeys
Click on New String Value
Enter serial_key_nw as name
Right click on the new string and hit "Modify". Now enter your serial key as value, which you can retrieve by right clicking on your Mount & Blade Warband on steam or from your buying receipt.
danyele101
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