How and from where can i download the ArcGIS 10.4 License manager, as I need to upgrade the license manager due to a security threat reported by our IT security team.
You can download everything from My.esri.com
You can use the newest License manager (2019) to server licenses for 10.4 and all the newer versions so you better use the newest version.
Have fun
Specifically, you need the ArcGIS License Manger 2019.0.
The older license managers don't address this issue.
https://www.esri.com/arcgis-blog/products/arcgis-enterprise/administration/its-time-to-update-your-arcgis-license-manager/
While you're at it, get this patch:
ArcGIS License Manager 2019.0 License Availability Display Patch
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