Start the organizer while holding down the shift key to bring up the catalog manger, navigate ot your old catalog, then Convert.
I went through this process several times. I managed to get the catalog within the timeline, however still have no tags or files. Still needing help!
Sent from my iPhone
Which tags are not getting converted in E11?
You should be able to see keyword tags + Places and Event tags in the Keyword Tag Panel and People tags too in the same panel provided View > Show People Tags in Tag Panel menu option is checked.