Like every other NOD32 "crack" that comes out, this one does not last as long as you say/think it will be.
There are two kinds of ways people get a free NOD32 (Allow me to clear things up a bit, hopefully ^.^):
1. Crack the client to be an extended trial forever, and update via the official servers.
2. Fake/re-use an official account.
Both of these attempts get blacklisted by the official NOD32 update server once they change the servers or look at who's doing what. So they both stop working after a while, or maybe a day.
The only way to get updates forever is to use alternative update servers maintained by people not affiliated with NOD32 (similar to Private servers for World of Warcraft). Whether you have a legit account, a copied-and-pasted account, or a trial that ends in 2050, you can use the alternative update servers.
Press F5 in the NOD32 window (i'm using the 3.0xx version) to see advanced options. Scroll down and click on the "Update" tab. Now you can as many alternative update servers as you want using the "Edit" button. Here's three that I switch between to make sure I get the updates I want:
http://u6.cnnod32.cnhttp://nod32.ecpm.net.cn/http://nod32.50jie.comNote: These servers are not 24/7 up to date as ESET's servers and are not updated as frequently, but hey, you're getting it for free so combine this with AVG Free and you're set.
Just glad I could contribute a little something to QSS