Serial Key Validation

Why is my serial key only valid for Pandora1.xxx series?

Because it's more affordable that way, and simple.
All registration info is based per series, and always was. If you own a single user license for Series 1 - that's releases 1.1-1.9.

If you decided to upgrade to Series 2, order your new registration info from here:
https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=P2VARYTWU269A

What is the major difference between the two?

The list is long and it's all under What's New/Version History:
Release Notes

You can also access it via Help files [Topics/Release Notes].

[quote="Admin"]Because it's more affordable that way, and simple.
All registration info is based per series, and always was. If you own a single user license for Series 1 - that's releases 1.1-1.9.
/quote]


More affordable?

Correct, subscription-based system with upgrade-discounts would be more expensive rest assured.