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Hi, Dave. Is it truly hanging each time at *exactly* the same part of the installation progress? In other words - ALWAYS when it's at "Adding extension... Multiprocessor Support"?
If you migrated anything from your old OS installation, first thing I'd likely do is create a "test" user - boot into that user and try opening Photoshop from there. If that works, some of what I've written below may help, when you boot back into your regular username.
Another option is - since the CC2017 extensions are in the main OS Library folder, there may be a problem with your computer Username's permissions, so Adobe may be having trouble accessing them for you. I see you did a clean install of both the OS and Photoshop, but it never hurts to repair permissions. I'd recommend restarting into Recovery Mode (command R during computer startup, until you see the Apple) - (How to start up your Mac in Recovery Mode ). Then, DON'T let it do that installation it wants to do - once you tell it your language, you can find a Menu Item that opens Disk Utility. that way, you can repair disk AND repair permissions. Also - since Photoshop, by default, will try to use your GPU with as much power as possible, I recommend resetting your nvram - by holding down command, option, P, R during startup until you've heard at least 2 startup chimes. With all the installations and uninstallations you've been doing, that part of the boot process can get "confused", so it wouldn't hurt to do that too (macOS Sierra: Reset your computer’s NVRAM or PRAM ).
If that still doesn't help, and you're working with a truly clean Photoshop installation, you may actually be having problems with one of the processors on your laptop. If that's the case, the Apple people can fix that for you (if you're still under warranty).
If the hang is actually happening at other parts of the loading process, it's possible that there's a problem communicating with some of the internet features of the program. Try it with your wi-fi off and see if that helps. OR, it's possible that a font or two is conflicting with some of Photoshop's own fonts. When you reinstalled the OS, did you also reinstall any of your other older stuff?
IF none of the above helps, or if you're just too burnt out to try all that, Adobe help is at (support))
Thank you for the reply. Yes, it hangs at the exact same spot. I may try and shut it down one more time, just to confirm it, then I'll walk through the suggestions you have.
Thanks for the reply. It's more help than I've had in days.
Well, after completing all the steps you listed, I'm still stuck. I'm going to contact Adobe next through the link you provided to see what help they can offer. If I still can't get it, I'll have someone look at the processors.
It's all just very frustrating as my CS6 worked fine, and now I can't do anything and have projects to do.