"Agent installations are missing" after 6.x upgrade

Document ID : KB000008423
Last Modified Date : 14/02/2018
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Issue:

During upgrade, following error shows up: "Agent installations are missing, please contact your System Administrator or our Supportservice"

This error message is present on the main RA webpage, in the space where "Download Agent Setup" menu and button used to be. 

Environment:
RA 6.x after upgrade
Cause:

Somehow the agent images were not copied over to the proper directories on the NAC.

Resolution:

The NAC holds the agent installation files in 2 places: RA_HOME/scripts and RA_HOME/webapps/nolio-app/apps 
Verify that the nolio_agent* files (as present in the ./agents dir on the 6.4 installation image) are present in both locations. 
If not, copy them over.