LabVIEW 6 can load and run code developed in LabVIEW 4.0 and later versions of the environment. The 4020 driver I found has a component developed in an earlier version of LabVIEW that is not compatible. If you can load it in an alternate version of LabVIEW (5.1 etc), you should be able to mass compile the vi's using this alternate environment and then load them from 6.