Question: Does Mi-Forms Installer v.126.96.36.199 support OS Windows 8.1?
No, v9.1.3 of the installer did not support Windows 8.1. However, this was resolved in patch 9.1.4 and in v10 of Mi-Forms. Getting a newer version of the client will fix this issue.
If you are running Windows 8.1 as your operating system and need to update your client or server, contact firstname.lastname@example.org to get a newer version of the client.