Yes, you can... Go to Adobe store and look for Photoshop Upgrade ... you don't need to upgrade the whole suite if there is something that you don't need or can't afford at the moment. I got Creative Suite 2 also... I don't need the whole suite, just Dreamweaver upgrade from CS2 to CS4... well ...
I got it... Before I got it, I got online with the rep in the store and asked questions... Even tho they tried to push the whole suite, I told them politely but firmly I only need Dreamweaver. I don't know what I needed in terms of tools, only that I was in web production and don't need anything like the soundbooth or illustrator or indesign. Flash is a want but for future date, Fireworks is also needed but that is at a future upgrade. Photoshop is needed but also for future... Needed right now was Dreamweaver and that is all I could afford. Got Dreamweaver upgrade. Photoshop is just around the bend as soon as I can afford it. I might get Flash first.... The point is, you can upgrade your suite collection the way you want it, not the way they are pushing it. You know what you need. They can only guesstimate (IMHO, very badly, too) and push their software collection with unneeded and unnecessary softwares. If you only need Photoshop and know what version you want, then by all means, go and upgrade it... Go talk with the adobe store rep and see what I mean.

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OS: Windows 11 64-bit
Poser: Poser 11.3 ...... Units: inches or meters depends on mood
Bryce: Bryce Pro 7.1.074
Image Editing: Corel Paintshop Pro
Renderer: Superfly, Firefly

9/11/2001: Never forget...

Smiles are contagious... Pass it on!

Today is the tomorrow you worried about yesterday