Found this in the FAQ section.
What if I have more than one computer? Can I activate and use the software on multiple machines?
For Single User License, NO. According to current Easypano End-User License Agreements, single user license only allows you to use the software on one computer. Concurrent use and activation on more than one computer is restricted and won't come through.
For Volume License, YES. You can activate and use the software on the allowed numbers of computers according to the licenses quantities you purchased.
Nikon D300, D3s, Nikon 10.5 lens, RingT105N+Footplate+MrotatorTCPs, Giottos MT9261 Tripod, Manfrotto 410 Jr geared head.
If you know the "secret" then everyday is a good day!