I updated the post with the following session. We will need to find a place for this on the download page, as well as the daily build. Meanwhile people should be able to test it already though:
Legacy Add-ons Bundle
As part of Blender 4.2 download, there will be an option to download a separate package with all the non-core add-ons before they were moved to the extensions platform.
- Download the Legacy Add-ons Bundle.
- Preferences > Extensions >
⌄> Install Legacy Add-on - Install the entire .zip file as one.