Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi stepan churpyna,
Welcome to Microsoft Community.
I realize that you've encountered a problem with install voicemod and I understand that it will cause you a lot of distress and we would very much like to help you.
I need to clarify and explain that Windows 8.1 support has ended on January 10, 2023, reference link:Windows 8.1 support ended on January 10, 2023 - Microsoft Support,We have not tested the installation of third-party software in Windows 8.1, and the forum support does not have permission to participate in the system development, we still recommend that you update to Windows 11 to install the software you need.
Best Regards,
Gina-MSFT | Microsoft Community Support Specialist