Can I buy a one seat LabVIEW license and later get credit when I buy a 25 seat license?

Unfortunately, there is not have an upgrade path from single user to 25 user, so there is not a way to get credit.

Note that this may be somewhat changed, as of 2011, because of two factors:
- Ravi has been replayed by Ray
- LabVIEW for Eduction has replace the LabVIEW Education Edition and the pricing structure is somewhat different. There is no 25-seat package anymore.