Without a license key BizMon is limited to only showing the top four application in a BizTalk group. To unlock BizMon and show all applications a license key needs to be added.
The license key will we sent in form of a file. This file then needs to be calkled "license.key" and be added to the "Application Data" folder of the server running BizMon. The Application Data folder is located in different places defepnding on version of Windows.