Version 2.4.9 installs a background service that runs silently. Every 180 days (the standard KMS reactivation period), this service attempts to re-activate your software without user input. To the end-user, this makes the activation appear permanent.
: Approximately 40MB , making it a portable utility that does not require a complex installation process. Version 2
You'll need to run the program with administrative privileges. Right-click on the executable and select "Run as administrator." Version 2