What a pity!
Only after you have clicked the link and entered the e-mail, write on the bottom that is a license for only six months and for users who are not already registered.
So after six months I can not use the software if not buying, because there is not even a minor version free, apart the usual antivirus avg with a few features.
You should write it on the page of the offer if the license is for a short time.
If anyone sees a free offer thought to be lifetime if not written more. Also because a common user looking for a good free antivirus if you do not want or can not pay.