If not on-line, where else could the catalogue content be such that you lose access to it?

Also, read the last line in the box about Update Service that handrawn posted. "Online services included in the Software (such as the Online Content Catalog including the templates, widgets, photos etc ) may end as soon as the Update Service expires, unless the Update Service is extended." There is no other Content Catalog than the one that is on-line.

If you can, and since Bezhad has indicated that a new version will be out in less than a month, wait until the dust has settled in August or September before renewing. Then, you should be able to get version 19 if it comes out within a year. Make sure to always download the contents of the Content Catalogue that is, obviously, on line, before the next expiry rolls around.