Photoshop is an expensive graphics program that you would be pretty lucky to find for download, but some earlier versions of PaintShop Pro are out there for download, try downlad.com or zdnet.com, or a web search.
"An Evil Barbarian with a Wrench in His Pocket......"
I have Photoshop .. but for most of the photo clean up,, or destruction,, that I do I use MGI Photosuite. It's super easy to use, pretty powerfull, and MUCH cheaper than Photoshop. About $65.00 I think.