Be careful with old versions!
These versions are displayed for reference and testing purposes. You should always use the latest version of an add-on.
Also, this hopefully fixes the issue people were having with it not sending the email. Something to do with the way I composed the email in the script.
If you are having problems accessing the addon, once installed, right click on your toolbar and go to Customise, A telephone icon should appear if you scroll to the bottom of the icons, drag this icon to the toolbar.