[Mark McLeod]

If you're just downloading an old build, then you'll need the matching vintage of the cRIO image.

You can use the newest image if you still have your original code and can just re-build your code under the latest LabVIEW version.

There might be minor updates to your code that you have to make as options and libraries may change in later LV versions, but usually you simply have to re-build your old code to drag in the cRIO image matching libraries.