My license manager runs on 10.1.
On one another machine I have upgraded to 10.5.1. But it does not allow me to access the license manager running on 10.1 with an error: ArcGIS for desktop /engine 10.5 cannot connect to previous versions of ArcGIS Lic Manager.
Please ensure that the ARCGIS Lic manager is 10.5 or above.
Do I need to upgrade the Lic manager also to 10.5.1?