Converting Published Files to Zipped Files without original PPTs

Is it possible to open a published file (not zipped) in Powerpoint and republish as a zipped file? My LMS vendor recently updated it's security settings which caused my published modules to quit working. The modules were published with Presenter, not compressed, and stored on an ftp site. Due to the system upgrade, the system is requiring a zipped file of the module. I can easily go to the ftp site and grab the most current published modules but I cannot open with Powerpoint. Locating the actual Powerpoint, with audio, that i used to publish the mods is an issue. What are my options? - Thx

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