With Cumulus 11, catalogs created with Cumulus 9 or 10 can be used without problems. However, if you want to use the Extended Search Indexing option with a catalog, this catalog must first be explicitly migrated to the Cumulus 11 catalog format.
A catalog’s type and size is displayed in its Catalog Settings window (Cumulus / Edit > Preferences > Catalog Settings > General tab.)
Explicit catalog migration can be performed with catalogs that are opened at the Cumulus Server, as well as with catalog files that are disconnected from the Cumulus Serverin:
IMPORTANT! Once a catalog has been explicitly migrated to the current Cumulus version, it can no longer be opened with a previous version of Cumulus! Canto recommends you to backup the catalog before you start the migration process!
Cumulus / 
Edit > Preferences > Catalog Settings > General tab.)