If you rely on Dreamweaver's template system (.dwt files), you can strip out the special comments and convert to standard HTML partials or a static site generator like Jekyll, Hugo, or Eleventy.
No. Adobe never released CS3 as freeware. Any site offering a "free download" is distributing unlicensed software. The only official download sources were Adobe's servers, and they removed CS3 in 2019.
If you have a legitimate license but want to move on, here's how to cleanly remove it:
Windows:
Mac:
Cleaning up activation files: Run the Adobe Creative Cloud Cleaner Tool (official, free from Adobe) to remove leftover licensing files.
Dreamweaver saves files as standard HTML, CSS, JavaScript, PHP, etc.—just with added proprietary comment blocks for template regions and library items.
