Lost lastest version- forgot about root directory version.

Is there a way to retrieve an articulate engage file .istr that was lost.  I accidentally copied over a later version on another server?  I was working on a .pptx file off of my hard-drive that contained some Engage files.  When I went to copy my hard-drive files to the LAN server, I replaced the current files on the LAN, not remembering that the root files being updated as I was working were on the LAN version and not my hard-drive version.  Thus 2 hours of work gone!.. : (  please help.   (I already have a call into our IT support team to try to retrieve previous versions, but they are slow.  And I'm wondering if there's an easier way that anyone knows that the Articulate software has?..)  Thanks for any help.

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