"The page below is from the manual of PRTG, our quick-to-install and easy-to-use network monitoring software"
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PRTG Manual: Download PRTG
On the Paessler website, you find two different installers for PRTG, a public download for the Freeware and Trial editions, and a login link to download a commercial edition, which is available for paying customers only.
Please download the latest publicly available program version from the Paessler website. Simultaneously, you get a trial key. It must be entered during the installation of PRTG.
Note: Every Freeware installation starts as a Trial version, permitting you an unlimited number of sensors for 30 days. After the trial period has expired, your installation automatically reverts to a Freeware edition with 100 sensors. Please understand that Commercial Edition users get prioritized support.
Downloads and updates are free to customers with an active maintenance contract. Please log in to the Paessler website to get the latest PRTG version. There you can also find your license key, which must be entered during the installation:
If you do not have an active maintenance contract and need one, please contact firstname.lastname@example.org.
Note: Once installed, you usually use PRTG's Software Auto-Update function to download and automatically install new versions. This eases the process of keeping your PRTG up to date and installing continuously released updates.