you can always unpublish a quest game by renaming the quest file as a zip file, unzipping it, opening the aslx in notepad, deleteing all templates and ensuring the top five lines of the code are this:
<!--Saved by Quest 5.6.6108.15891-->
<asl version="550">
<include ref="English.aslx" />
<include ref="Core.aslx" />
<game name="Kate's Uni Days">
in other words the dozens of lines between asl and game name are replaced by those two include lines.
after that you can open the aslx in quest editor and it will be exactly in the same shape as it was before you published it (all the tabs on the right will work again.)