Can I upgrade my Photoshop CS6 Standard to CS6 Extended

This is something you would need to discuss with Adobe. It doesn't matter what anyone here might say, Adobe is the one and only source of the right answer to this one.

Apple has no say in the matter. It's not their software, so they can't give you an upgrade. If Adobe has said that you can't upgrade the way you want, then that's the final word on the matter, unfortunately.

According to Chris Cox (a long time programmer for Adobe, and who answers a lot of questions on Adobe's Photoshop forum), the software is actually identical. What you enter for a serial number tells it to start up either as PS Standard, or PS Extended.

I think you're stuck, though. The number you have, and the price you paid, which is a lot less for the Standard version, is already linked to your Adobe account. The problem there is if you paid for an "upgrade", you would now have two, separately valid serial numbers for one purchased product. It's highly unlikely they would allow that.

Alice Whiston wrote:

Yeah I spoke to Adobe again and they said the only way I can get the Photoshop CS6 Extended is to buy it separately... which is irritating because it will cost £230. When I have already paid for the porgramme in the first place ..........

You paid for the Standard version not the Extended version. Only Adobe can decide whether you can get the Extended version for free, (knowing Adobe I very much doubt that you can)

I didn't want the extended for free! I wanted to pay the difference and upgrade it but they said I couldn't.

Yes, we know. But as I explained, the only way to change the software you already purchased to the Extended version is to give you a new serial number. That would mean having two serial numbers you can use to install the software with.

You're allowed to have any Adobe software activated on two computers. With two serial numbers for what is really only one purchase, you'd then be able to install PS on four computers; two as Standard and two as Extended. There's no way for Adobe to "take back" the original Standard serial number, or negate it. You would have two full licenses for one original purpose. That's why they won't do it for only the difference in price between the two versions.