Retaining information in Upgrade from PSE10 to PSE15

I have an extensive catalog of Albums and Keyword Tags in my Version 10. Recently updated to Version 15, but have not figured out how to resurrect this information in the new system. Where can I find a reference on how to get my information into the updated format?

When you installed PSE15, you did get a message to 'upgrade' your current catalog. If you agree, that creates a new catalog in the version 15 format with ALL the data from the PSE10 catalog. If you missed that opportunity, you still can convert any old format catalog to the current one by using the 'convert' button in the catalog manager File option of the organizer.

That is if you install PSE15 on the same computer which has the media tree, the old Elements version and its catalog.

If you have migrated to another computer:

Move Elements Organizer catalog | Elements 6 or later