“Downgrade” ClickOnce application

Question

What is the recommended way of offering the users of my ClickOnce application a way to downgrade to the previous version? (In case the new version doesn't work on their machine)

Answer 1

In the ClickOnce deployment setup, leave the minimum required version as the older version. This will give them the choice of whether or not to upgrade. If they upgrade, then decide they want to revert back to the older version, then they can do so through add/remove programs.

If you set the minimum required version as the new version, they will not have the choice to go back to the older version.