You can edit a previous version of a flow by promoting it to the latest-saved version. Promoting a flow version moves it to the latest-saved version, making it available for editing.
Note: Before performing this procedure, note that the existing latest-saved version will be overwritten by the version you promote and edit. If you want to preserve a copy of the existing latest-saved version, save it as a version before promoting the older version.
The selected version is promoted to the latest-saved version. You can now edit the flow.