What is the three-versions-back product upgrade policy?
For individual products, you can upgrade from up to three versions back. For example, if you have Illustrator CS, CS2, or CS3, you are eligible for the upgrade price for Illustrator CS4. If you have an earlier version, for example, Illustrator 9 or 10, you are not eligible. The exception is Adobe Premiere Pro; you are eligible to upgrade from any earlier version to Adobe Premiere Pro CS4. For individual products, if you have a version earlier than three versions back, you are not eligible for upgrade pricing — you will need to pay the full retail price. For Creative Suite editions, you can also upgrade from up to three versions back, but there is tiered pricing (see tiered upgrade pricing information in the eligibility, pricing, and purchasing options section earlier in this FAQ).