Temperature Monitor 3 is a gratis application. It isn't even possible to pay for it. There are also no differences in the terms of free distribution between this version and all previous versions.
There is in fact an additional "Lite" version but this refers to a lightweight user interface, which consumes no space in the Dock or on the Desktop because it runs in the menu-bar only. The Lite version is gratis the same way as the full version is.
Please stop posting false claims. It's a bad idea because readers can easily verify that you are mistaken.
Marcel Bresink Software-Systems
Technical Support and Customer Care
Temperature Monitor
Displays all accessible temperature sensors.
Version: 4.8