This is not really a question but enable others to get DW working.

I have atlast had time to explore DW more fully and AI offered these suggestions which have got DW working again for me:

• How to Correctly Set Up Your Site
• Open Site Setup:
  • In Dreamweaver’s top menu, go to Site > New Site... (or Site > Manage Sites... if editing an existing definition).
• Configure General Settings:
  • Site Name: Give your project a recognizable name (e.g., My Static Site).
  • Local Site Folder: Click the folder icon and choose the local folder on your Mac where your .html files reside.
• Leave "Servers" Empty:
  • In the left panel of the Site Setup window, skip the Servers tab completely. Static HTML does not require a local network or testing server definition.
• Save:
  • Click Save and then Done. Your files will populate the Files panel on the right.

• How to Preview Your Pages in Safari
• Dreamweaver includes built-in preview mechanisms that handle port binding automatically.
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• Real-Time Preview (Recommended):
  1. Open any .html file from your project.
  2. Click the Real-Time Preview icon (the small device/browser icon at the bottom-right corner of the workspace).
  3. Select Safari. Dreamweaver will start its internal preview server on an automatically assigned dynamic port (such as http://127.0.0) with live reloading as you make edits.
• Direct Browser Preview:
  1. Press Option + F12 (or your assigned secondary browser shortcut) to preview the page directly in Safari via the local file path (file:///Users/...).
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• This worked for me on a Mac so I hope that it may help others.