The Use Offline Help in Adobe Products web page [Use offline Help in Adobe products ] says the following:
"When you are connected to the Internet, and you select Help in your Adobe product, your web browser opens the product's Help page on the Adobe website."
When I select Help in Photoshop CC 2017 while connected to the internet I get this popup error window:
Does anyone over there check this stuff out before putting it onto their website? Things like this are very annoying given what we pay for CC.
I tried Photoshop > Help > Photoshop Online Help and it does indeed open the Online Help Page linked below in my default browser, FireFox.
So check first to see what browser is your default.
OSX 10.12.4/CC 2017.1/MBP Mid 2012.