Please try the below link to purchase the standalone CS6 Photoshop.
Understand that Photoshop CC runs on your computer, not on a server in the cloud. If you purchase a yearly subscription (photographers special including Lightroom) your computer would only need to be connected to the internet once or twice a year for verification. Will you actually be using the internet less than that? You would also get updates via internet as with most programs. Internet connection is not required to use the program and your pictures are also stored on you local computer as is normal.