If nothing happens when you double-click the installer app
I couldn't install the client (tried v 65 and 66) on my new Sierra-based MacBook Pro.
I did a bit of digging, and noticed there's a "runner.sh" script inside the installer app, so I tried to run it in a terminal, and it complained about missing permissions to do something. I then ran it with sudo, and the app installed. It does, however install as the wrong user when you do it like this, so you need to fix that as well.
In case this happens to anyone else, these are the steps I used to install it correctly:
- Double-click the .dmg file so that it's mounted (the window with the installer app appears)
- Open up Terminal.app (use Spotlight, or find it in Applications/Utilities)
- Type in sudo /Volumes/Private\ Internet\ Access/Private\ Internet\ Access\ Installer.app/Contents/MacOS/runner.sh
- Press enter, and provide your password when prompted
- When the app starts, click its icon and select Exit
- In the terminal, type in sudo chown $USER:admin -R /Applications/Private\ Internet\ Access.app
- Still in the terminal, type in sudo chown $USER:staff -R ~/.pia_manager
- Start the app again
The last steps are important, if you don't do them, you won't be able to save your preferences (including your login credentials) or update the app.
HTH 
Comments
I get through the first five steps fine, but when I try to run 6 and 7, terminal says, "chown: -R: No such file or directory"
I've tried v68, 66, and 65, and none of them work.
Can you, or someone from PIA, help? I've been a very satisfied customer of PIA for four years and this is frustrating.
I am running an early 2015 macbook pro, OSX sierra 10.12.3 (16D32).
Thank you.
The problem is caused by "corrupt admin permissions" but if I knew what that meant I guess I would be answering the questions not asking them.