Sign in normally and enjoy
(if someone has made a similar post, the purpose of this is to spread the word)
There’s one more thing you have to do, to avoid other prompts and Skype downloading newer versions automatically, you can copy the installer (or another file) to the temp folder and set as read only. See also:
BetaNews’ article says about 7.36,
Unfortunately for me as for today Skype 7.36 is also blocked from signing in.
Probably not globally yet, but will likely be soon.