As for updating to 10.6.8, I'd like to, but I tried it twice, and twice got the same problem: the fonts on the screen didn't look right. And from coming from 10.4.11, 10.6.3 looks so much better, and everything works so well. It's probably the best computer experience I've ever had after all these years. I've got everything set up the way I like.
Yes, it would be nice to be able to use the App Store. At the moment, I don't want to do anymore troubleshooting. I just spent months learning about routers, much trial and error, purchasing and returning, talking, studying, only to conclude that the best solution was to move the computer to a different room closer to the router. With my back pain, I don't want to do something so elaborate as to troubleshoot an operating system.
There was a guy at OfficeMax who helped me a lot. He really knew his stuff. And he was an adult. Contrast this with our local Best Buy.
OS X 10.11.6
iMac 21.5", Mid 2011
2.8 GHz Intel Core i7, 24 GB
AMD Radeon HD 6770M
Using Apple computers since 1980