Hi Dora,
First check with your local NI Field rep. They may be willing to help you out, free of charge.
Otherwise,locate an NI Select Integrator or an Alliance Member in your area (NI web site will help with this).
If they have been around long enough, they should be able to round-up some of their old disks and set up a system to do what you need. Warning, this will not be easy or quick, so you may have to pay for the time, BUT, it will generally be cheaper than trying to re-write it yourself from scratch.
Ben Rayner
Data Science Automation (a Select Integrator)
(I am currently running LV 5.1.1, BV 2.1.1, and LV 6.0.2 but not earlier)