Extras are no longer supported. That said, you can install an older release from here, during the install process, you will see a "Options" button, please click it and make sure that the "Install/Update Extras Manager" checkbox is checked and then continue the installation:
You are very welcome, could you please click the "Accept this as solution" button on my post, that solved your issue, so that others having this same issue can find this information easily, thanks.
For your future attention when using newer versions of Skype: there're some client programs for chess playing over Skype which make it possible for you to playing chess with your contacts. For example Chess4Net (google for it).Last version is 2011.1, it has even an option of broadcasting your games to other people.