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LabVIEW
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That's what version control software is for. Right now, if you don't have a copy somewhere, you can't.
What kind of "mistake"? Please clarify. What is the "first program"?
LabVIEW like most other programs has an "undo" feature with a pretty long history, just repeatedly press ctrl+z to go back a few steps. (note that some operations clear the history, so this is not always possible)
If you haven't saved the new version under the same name, you can also do a "menu...file...revert" to go back to the last saved version.
