<li> Open ArcGIS administrator
: [[Image:ArcGIS administrator 10 2.png|300px]]<br>
<li> In the lower left part of the window, you see a dropdown drop-down list where you can select version. Select 10.1.
: [[Image:ArcGISAdmin1.png|300px]]<br>
<li> Activate ArcEngine 10.1. If the expire date is not updated then you need to Activate the licence from TrayLauncher menu Client configuration.