Famatech has released newer builds (e.g., 3.5.2.1, 3.5.2.2) that fix security vulnerabilities, including the infamous "BlueKeep" style flaws. Searching for an old 3.5.2 key leaves you exposed. The latest version works on Windows 10, 11, and Windows Server 2022.
For less than the cost of one hour of an IT consultant’s time, a single Radmin 3.5.2 license costs approximately $50 USD. This gets you:
If you decide to purchase a genuine license, here is how to make it "work" without issues:
Implement Radmin-like license key system with generation, validation, and activation features
