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The ActiveReports installation includes the MESCIUS License Manager that you can use to manage licensed on a developer machine. You can also install this tool using the sa3client NuGet package
ActiveReports runs the MESCIUS License Manager upon closing if you check the Activate Now checkbox:

Alternatively, you can run the MESCIUS License Manager from the start menu's MESCIUS folder.
In the MESCIUS License Manager UI, click Activate Serial Key.
Enter the serial key you have received from MESCIUS (including all the capital letters and special characters), and click Activate.

If the license key is valid, the license will be activated and the UI will display the corresponding message:

The new record in the MESCIUS License Manager will indicate your license and you can Refresh or Deactivate it using the corresponding buttons:
