Sites using the current template will already have “template-assets” and “template-assets-custom” folders. The “07” folders inside those should go in the existing folders on your site. This way, installation of the new templates does not affect any sites using the old template.
Once the folders are in their appropriate locations, the upgrade process can begin.
Two include files used in the old template will need to be recreated for the new site, the branding space and the menu.
Follow the instructions for Customising your include files - transferring the information in your current template files to the new custom assets.
Your site’s existing menu include (probably ./template-assets-custom/includes/c_menu.html) simply needs to have the table structure removed. There are a few lines of code before the <h2>, a few lines between the </h2> and the first <ul> and quite a bunch of lines after the last </ul>. Otherwise, all is the same.
The old duplicate class still works as before. So if your menu contains more than one link to the same page, you can prevent the menu getting confused by nominating links to be ignored.
<li><a href="/2.html" class="duplicate">Section 2</a></li>
In the blue template there was a javascript variable which, when manually inserted into the editable area at the head of the page would override the default behaviour of the menu - allowing pages to ‘belong’ to a part of the menu even if their URL did not appear in the menu.
That variable name has changed, but the contents remain the same, so it is possible to convert all instances simply by using find/replace to replace var menuParent with uM_menu.parent_path.
The location of some include files in the old template may have been in editable areas and will not automatically update when the new template is applied. This is easily overcome by using Dreamweaver’s Change Link Sitewide... command from the Site menu.
For example: change /template-assets-custom/includes/c_branding_space.html to /template-assets-custom/07/includes/branding_space.html.
Once the new include files are in place, open the template file itself and ensure that it references your custom include files (branding space, menu etc.). Then the template should be ready to apply to your pages.
Open a page using the existing template, and from the Modify menu, select Templates » Apply Template to Page... and select your new ..._07 template.
All the standard editable areas have been preserved, so there should be no problems. Some content may need to be adjusted, but most important legacy styles have been migrated to the new template.
Home pages are a special case. The content in these pages is structured differently and will require more substantial changes.
For more details see this ‘guide to upgrading home pages‘.