Its obsolete now - Adobe have brought out the CC version (subscription based) the chances of finding a complete legitimate version on the net is extremely low. In addition licences are not transferable so second hand packs are an issue
You can go to www.adobe.com/downloads and get a trial version of Adobe Photoshop CS4 for free.
The official trial downloads for Adobe CS4 are harder to find now, but can still be located on Adobe's servers - see the Related Links below:
the reason why you cnt find photoshop 7.0 because it really not that popular anymore but you can download photoshop cs4 trial
http://filehippo.com/download_photoshop/
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 purchase (download) Adobe CS4 through Adobe's website as well as at other software retailers. With proper identification, you can also purchase educational versions at drastically reduced rates at Adobe's site as well as sites like Academic Superstore.
Nowhere, Photoshop is not free software.
Photoshop CS4 Bible Check Here http://www.amazon.com/Photoshop-CS4-Bible-Stacy-Cates/dp/0470345179
You can download it by searching, "Adobe After Effects CS4 Download." After you search it, an option should be, Adobe After Effects CS4 on Adobe.com. Once you select that option you can sign-up on Adobe, and download the free trial.
Filter -> Blur
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
cs5 is better