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Updated June 16, 2016
This article provides brief information and steps to resolve the issue when a NPM 12 upgrade fails on additional poller due to compatibility issues with the UDT version installed.
An error message will appear from the installer when installing UDT version 3.2.2 on the additional poller.
NPM version 12.0
The primary application server was upgraded successfully to UDT 3.2.2, and then upgraded to NPM 12 per the upgrade advisor. The server was then upgraded to UDT 3.4.2 and this should not have been done. UDT 3.2.2 should be upgraded on the additional pollers first.
Now UDT 3.4.2 can be ran to upgrade the additional pollers.
Note: If it complains about activating a license just hit cancel and move forward, this will not affect the application.