Update: The six-month link has now expired. As for the full year offer, well, some existing users are reporting that it isn't working for them either. That promotion is now aimed at new or potential users.
The majority of features that the LastPass password manager offers are available for free, but users still need to go premium for $12 a year to get the full package. That's not an exorbitant fee by any stretch, yet there's a way to put this off for up to a year and a half if you rather save yourself the money.