Hi there. I was recently trying to install my legitimate copy of Adobe Photoshop CS6 on my MacBook (running 10.13) but when I put the Serial number (also legit) in it says I need to connect to the internet and try again. I've tried the entire list of troubleshooting tips for connecting to adobe's authentication service but none have resolved my issue. I've also tried on 3 different networks and I get the same error. I'm wondering if adobe is not allowing older versions of Photoshop to be installed, authentic or not? Or perhaps I'm missing something? Any advice would be much appreciated.