Let's return to the problem: is it expected to see the upgrade policy on this computer? If some old version of the Task Server was installed then NS could think this computer eligible for the upgrade, not for the clean install. May you review the Task Server upgrade collections in NS Console -> Site Management -> Settings -> Task Service -> Advanced -> Task Service Upgrade? Could it be your server will be listed there?
Some more hints for the agent side:
Agent has "Task Service Upgrade (x64)" policy in disabled state.
Ordinary, such record indicates that the policy was able to execute successfully. You may see the details of the policy run by dbl-clicking to the "Task Service Upgrade (x64)".
First, check the "Run History" for "Status" and "Exit code". "Run Completed" and "0" will indicate the run completed successfully. "Source" will show the path to package file. By default all packages placed to "C:\Program Files\Altiris\Altiris Agent\Agents\SoftwareManagement\Software Delivery\GUID_NAME".
Tab "Details" contains information regarding the command line that was executed for the specific package. You may use it without "/quiet" parameter to launch the setup again. In such case you will see the UI messages if something goes wrong with the setup. Also, please review windows application log after the setup - it may contain some useful information.
Anyway, the proper way to roll-out plug-ins is automatic install, not the manual one.
Thank you,
Alex.