There is a new feature available in mAuthor editor – the “Abandon all changes” button.
It is now possible to erase all changes implemented in the editor during the current session and restore the previously created version of the presentation. Clicking on the “Abandon all changes” button will automatically close the editor and restore the previous version of the presentation. Re-entering the editor will open the previously created version as the current one.
More information on version control is available in mAuthor documentation.