Yes, you can upgrade from Photoshop CS3 (or earlier) to Photoshop CS5 Extended, no problem.
You will have to upgrade to CS3 then CS4 i belive.Ive found this that you might like:http://www.softpedia.com/progDownload/Adobe-PhotoShop-Trial-Download-696.htmlIf you look at External Mirror 4, it says 'Update to CS3'.Im not sure if you have to enter a serial or anything but it there if you need it.
cs5 is better
Vibrance adjustment starts with cs4
To move from Photoshop 7 to CS4 will require a purchased full copy of Photoshop CS4 as there is no upgrade available for versions of Photoshop older than 8 - the first CS version.
The extended versions have all of the features the normal ones do but they offer extra features such as the ability to import and edit 3D graphics, video enhancement and more tools to use for editing images etc.
you can use any photoshop but i tend to use CS3 or CS4
Photoshop Portable is basically just a "ripped" copy of Photoshop CS4, making it completely free. No brush presets, tools, filter galleries, text sets, or anything else were changed in the "ripped" version from the "normal" version. It is still a hot topic over whether it is plagiarized or not, as they did give credit to all the original creators of Photoshop CS4 on the loading screen.
CS4 Extended is the legal version that you must buy. CS4 Portable is a free, illegal version that does all the same things as CS4 Extended, the only difference is that you can't add plug-ins
http://filehippo.com/download_photoshop/
probably you want extract,yes you can download from adobe site
From the Adobe.com website.You can download full version of Adobe Photoshop with crack for free at:http://www.filez247.com/index.php?search=Adobe+Photoshop
You can use Photoshop CS3, CS4 and CS5 with Mac OS X 10.7 (Lion). Adobe reports that Droplets will not work but they are working on a fix for that.