Use the official offline update tool for safe, license-free updates on offline machines. For online PCs, either purchase a legitimate license or switch to a free antivirus solution. Your data is worth more than the price of an ESET subscription.
While the idea of a "free update server" for ESET NOD32 might sound like a handy shortcut, it is generally a risky and unreliable eset nod32 update server list free link
If you need to update your software, use these official methods provided by ESET : Use the official offline update tool for safe,