To restore an older version of a workflow, follow the steps given below:
Step 1: Go to the workflow of which you want to restore the version.
Step 2: Now, click on the ‘clock’ icon placed beside the 'Workflow Execution History' icon.
Step 3: A new window appears where you can see list of all the versions with the name of the editor.
Step 4: From the list of versions, click on the one that you want to restore.
Step 5: Click on ‘Restore This Version’ link located at the top of the page. This will restore the version, and will be saved as a new (latest) version.