Open a command prompt and run the following command.
netsh wlan show profiles name=* key=clear > Desktop\Passkeys.txt
You can now open up the Passkeys.txt file and view all your saved networks.
If you just need to view one network, you can refer to this link.
It appears that with one of the latest 8.5 updates that you can no longer change Wireless Security to none from the web interface. Work around is to disable it in a config then apply the config. You can do this from the command line or upload a config under the System tab.
Go to the System tab, backup configuration
open configuration in a text editor and change
“aaa.1.status=enabled” to “aaa.1.status=disabled”
Upload Configuration and Apply to device
sed -i '/aaa.1.status=enabled/aaa.1.status=disabled/g' /tmp/system.cfg
The above should be it, or you can manually edit “/tmp/system.cfg” and change the following line