The section "Distributing VIs" in chapter 12 of the LabVIEw User Manual covers this. In order to be upgraded, the VI must have the diagram (or "source code"). If you have third party VIs without diagrams, you'll hve to request an upgrade. If these are VIs you created yourself, the way to avoid the problem in the future and still protect your code is to use password protection instead of saving without diagrams.