undo when says cant'undo

[mimuma]

I am working doing my power point presentations when I've tried something new
about animation and wrongly click the mouse and now I can not retrieve my
presentation. I put the same name to two presentations and I lost one! How
can I undo my mistake? It says "can't undo" the action. Could someone help
me? thank you

 

[Luc]

mimuma,
Sounds like you have overwritten one file with another. If that is the case
you are out of luck.
Unless you have a backup somewhere you can restore.