InfoPath Dev

I lost data on my form too after I made changes and republished it.  I just checked my versioning settings, and it is set to "Automatically upgrade existing forms."  Should I instead use "Do nothing (existing forms might not work properly)"? How can you reverse what you've done?  The field I edited was just ...

I made the mistake of updating and publishing my InfoPath form when I made changes that I should not have.  Thus, I lost some information on the submitted forms.  How can you republish the older version? Thanks!

This is probably too little late, but maybe it'll help someone else who looks to this in the future.  I use this to add a print button to my forms.  Works perfectly.