i found a way to sign in to 6 and 7. but you can only do it if you can sign in to 5.5
step 1: install 6 or 7. i found a good place to find installers is http://www.skaip.org/
step 2: download 5.5 from the video linked in the post
step 3: sign in to 5.5
step 4: close 5.5 but don’t click the sign out button
step 5: open the version of skype you downloaded