Adobe offer free “Post Announce Upgrades” to anyone purchasing a CS4-edition product – including Student editions – after April 12th 2010 and before July 11th 2010.
As many CS4 products are currently still available from most retailers, this could be your opportunity to save a bit of money on the full CS5 price – I saved about £80 on the full price of Web Premium CS5 (Student edition).
After registering your CS4 serial number, visit the Adobe Customer Support Portal (Adobe login required) and complete the “Post Announce Upgrade” form before July 26th:
Assuming you successfully complete the form, you should receive your CS5 upgrade in the mail after a few days.
Notes:
- You must purchase your CS4 product before July 11th, and complete the PAU request before July 26th.
- This handy page on Amazon UK lays out further information and T&Cs, though the offer is not limited to purchases from Amazon.
https://www.adobe.com/cfusion/support/index.cfm?event=portal