WinRFCalc download page
The current version V2323 which can be downloaded below, is an intermediate pre-release of V2400 which is under development at present and has limited functionalities.
Per 2 August 2023 both the installer you download and the WinRFCalc.exe file inside the installer are Digitally Certified and Signed in order to increase trust with WinRFCalc users and with respect to general software safety.
WinRFCalc Software Signing Certificates, click on the picture to enlarge
To check the digital certificate of the installer on your device, right-click on the installer .exe file after unzipping and right-click on the WinRFCalc.exe file in the installation folder after installation.