Extract the .rar file; (The password is: technicalkrkr)
Run the "VoicemodSetup.exe" and install the program normally. However, make sure you don't launch it when the installation is finished;
When VoiceMod is installed, go to its directory (you should find VoiceMod in your desktop, right click on it and open file location);
Drop both "lib" folder and the "VoicemodSetup.exe" file in the folder you have just opened (VoiceMod Desktop), click replace files. And there you go, launch VoiceMod and enjoy your free premium version.