There is not a direct way of saving back 2 versions. LabVIEW only supports saving a single version back, ie 7.0 to 6.1. I believe the conversion kit that was mentioned refers to the ability to open old versions, 3.1, in newer versions of LabVIEW.
The only way that you can save a VI from 7.0 to 6.0 is to save it first as a 6.1 VI. So you need to save for previous as a 6.1 VI, and then open the VI in 6.1 and save it for previous again.
Every time you save back you increase the chances that you will loss a section of code. For example if your VI is using the event structure. You will be able to save to 6.1, but not to 6.0, because 6.0 does not have the event structure. So going through this process lets you know what features you lost at what versions so you ca
n weigh how important that feature was to you versus the cost of upgrading.
If you have LabVIEW 6.1 you can do the save yourself. If you do not and your project is relatively small you may be able to post it here and have someone attempt to save it back for you. However you need to keep in mind that we won�t be able to test or verify that the save back worked.
Evan
National Instruments