Hello,
When the client version is reported as SEP 11.0.5, that clearly indicates that the Installation did not succeed on the client machine.
You could pull the Application log from the client machine and check if the installation was successful.
From the SEPM, Monitors, Logs TAB could also be used for what you need. From there you can select the log type you are interested in, specify date ranges, machine names, and other fields to narrow your results, etc.
Secondly, when migrating from SEP 11.x, it is recommeded to upgrade to SEP 12.1 RU1 first and later to SEP 12.1 RU1 MP1
In this case, I would suggest you to restart the client machine and check again.
If that does not help, replace the sylink file on the client machine and check again.
Hope that helps!!