Installation of DeviceLock Service via 'Install Service' plug-in of DeviceLock Enterprise Manager console fails returning "The installation source for this product is not available. Verify that the source exists and that you can access it. (1612)" error.
This error is a Windows Installer error not related to DeviceLock directly.
Please refer to the following Microsoft Knowledge Base article containing information about the error and how to fix it: http://support.microsoft.com/kb/932857/en-us