By strange coincidence, I was asked by a friend to get Skype working on their laptop (mac) as overnight it wouldn't work and kept deferring them to 'download the latest version'. This was done several times to no avail and it became clear that their OS is/was considered no longer worthy and once a newer OS version was downloaded, PITA due to time constraints, then the wonderful Skype worked again, NEWER<STRONGER<FASTER<BETTER, or not as the case may be...... ;-)