Note that in order to download Voicemod, you would need to log into the system first; you can use different social login options or your e-mail, please check the following articles if you find issues while tying to log in:
https://support.voicemod.net/hc/en-us/sections/360005935979-Login
As stated, to download Voicemod you would need to create an account; you can do so through the following link: http://www.voicemod.net/downloadVoicemodAccount.php
After logging in with your prefered method, the download will start:
Finally, when the installer is downloaded, just double-click the executable to start the installation.
*Although to start using Voicemod you must login anyway, if you have problems downloading you can download it directly from here: https://www.voicemod.net/downloadVoicemod.php