The 1.1 version of the Dreamweaver template has no changes in the XHTML that produces the layout of the page. It adds an optional, configurable search at the top, which is in addition to the UW search. The only other change involves a simplification of the Template Properties.
If you have been using version 1 of the template, and are satisfied with it, there is no reason for you to change to this newer (1.1) version of the template. However, if you have created only a small number of pages, you might wish to switch.
Because the template has different regions, the conversion process is not as simple as saving a new version of the template with the old name, and letting Dreamweaver update your pages.
The simplest method of conversion will work reasonably well if you have perhaps twenty or fewer pages.
Repeat steps 3 through 7 for each page of your site.