Hello,
You have to open yopur application with LabVIEW 8.5, go to
file and
save for previous version and select LabVIEW 8.0.
This means you need a LabVIEW 8.5 version, I have no idea if the evaluation version of LabVIEW 8.5 can save for previous version

By the way, LabVIEW 8.1 does not exist. Only 8.0, 8.0.1 and 8.20
We have two ears and one mouth so that we can listen twice as much as we speak.
Epictetus
Antoine Chalons