Update a previous version of plugin when the new plugin is built from the scratch

If you put your plugin in the WP Repository, and

  • change the version number in the readme.txt file
  • put the new code in a new ‘tags’ folder with the version as the folder name
  • also put the new code in the root of your repository (and I also put it in the ‘trunk’ folder
  • and do the SVN Update thing

Then anyone with the plugin installed will get a notice about the update via the Admin, Update screen. And updating it will get the latest version installed on their WP system.

I’d put some sort of notice on the Settings screen about the new version, in addition to the needed information in the readme.txt file , which is used to display text on the various pages on your WP plugin page.