Download the official PRTG 100 version. For most small businesses and home labs, 100 sensors are plenty. If you truly need more, look at alternatives like Zabbix (fully open source) or LibreNMS.
It looks like you're searching for a free PRTG license key. I want to provide a helpful and honest answer, as this touches on software licensing and security. prtg license key free
There is no valid "free license key" for the full, unlimited Paessler PRTG Network Monitor. Any website offering a crack, keygen, or shared license key is likely distributing malware, spyware, or an illegal copy. Download the official PRTG 100 version
Stay safe – free monitoring isn't worth compromising your network's security. prtg license key free