Apparently the intention was that although the software was eligible for free updates (LR4 went from 4.0 to 4.4) an upgrade to LR5 or LR6 would not be free. However, the possession of a registration number for a previous version qualifies you for a discounted upgrade price when purchasing LR6 and so far as I know that applies to a copy of LR4 purchased at the student price. But, if the copy of LR4 was a promotional free copy bundled with a new camera, it is possible that its serial number will not qualify for the upgrade price, but I don't know if this is so.
Great, thanks for the reply! Will I have to enter my serial number when I go to purchase, or will it not be until I've paid and attempted to upgrade that I run into issues?
When you purchase the upgrade from Adobe, the website will ask what version you are upgrading from. If you install the upgrade on the same computer that your original version was on, the new installation will usually find the old serial number. But it would be a good idea if you have your original serial number available during installation. In any case, an upgrade installation requires that the original serial number be available.
Any version of Lightroom can be upgraded to the latest version.
Could you please send me a personal message with the serial number of Lightroom 4 so that I can check at our end whether its can be used to upgrade to new version or not.
Informed the customer that the Lightroom copy is eligible for upgrade.