You can't use the "Tunnelblick" folder as a configuration because it is not a configuration (it
configurations).
Please note also that simply copying files or folders does not ensure that they have the proper ownership and permissions. Configurations should be installed.
Here is a guide to copying configurations from one computer to another:
To copy shared configurations from a "source" computer to a "target" computer:
- Install Tunnelblick on the target computer. Leave it running with its icon visible in the menu bar.
- Copy the source computer's /Library/Application Support/Tunnelblick/Shared folder to somewhere on the target computer (such as the Desktop).
- Open the target computer's copy of the folder in a Finder window and select all of the configurations that you wish to install.
- Drag all of the selected configurations and drop them on the Tunnelblick icon in the menu bar. The pointer should change to a green plus sign ("+") when it is over the Tunnelblick icon until you drop them.
You'll be asked if you want them to be shared or private, and asked for a computer admin's authorization to install them.
The Tunnelblick settings for the configurations will not be copied unless the original configurations were set up to include them (which is very unlikely), so you will have to either set them up manually or copy the preference file. (The OpenVPN settings for the configuration are included in the configuration and do not need to be copied.)
VPN credentials (usernames, passwords, and private keys) will not be copied either. I believe they could be "exported" from one computer and "imported" to another computer using /Applications/Utilities/Keychain Access, but have never done that myself.
To copy all Tunnelblick settings from a "source" computer to a "target" computer, simply copy the file /Users/USERNAME/Library/Preferences/net.tunnelblick.tunnelblick.plist from the source computer to the corresponding Preferences folder on the target computer. (If you do that with Finder the ownership and permissions should be OK.)
To copy private configurations, copy the source computer's /Users/USERNAME/Library/Application Support/Tunnelblick/Configurations folder and proceed as above.