Confluence versions 6.0 or newer are only compatible with Scroll Versions versions 3.4.0 or newer.
It's not possible to downgrade from version 3.x to version 2.x
If you are using version 3.x of Scroll Versions, you cannot downgrade to version 2.x.
- Make sure that spaces where Scroll Versions is activated are not edited by users. Ideally, redirect all users accessing Confluence to a maintenance page until the downgrade is complete.
- Uninstall Scroll Versions, Scroll Platform and Scroll Runtime via Add-ons > Scroll Versions > Uninstall,
- download the earlier version you wish to install.