Reverting and restoring previous versions of custom scripts
You can revert custom scripts to previous revisions and also restore custom scripts that you have deleted by using the Extension Script History maintenance form. This form retains a history of previous revisions of your custom scripts and custom scripts that have been deleted. The custom script versions maintained here are read-only.
This feature can be useful if you want to revert the changes in your current version of a custom script to a previous revision or restore a deleted script.
To revert or restore a custom script: