The Mr. E tool can be installed directly through the chrome store.
You will need to have a chrome browser on your Desktop or Laptop. The tool will not work on mobile or tablets.
You can click on this link to the Mr. E tool link on chrome store.
Once you add the extension, you are redirected to LinkedIn automatically.
Now, visit any profile and click on "Click to get contact" You get the contact information within few seconds.
Watch this demo video for more help