Web-to-Host supports these client operating systems:
Microsoft Windows Installer (MSI), an installation and configuration service, must also be installed on the client PC before installing Web-to-Host Pro.
If no MSI is on the client workstation, an error message is displayed. Web-to-Host does not pre-install MSI. You can download the latest version from:
http://www.microsoft.com/msdownload/platformsdk/sdkupdate/psdkredist.htm
https://support.microsoft.com/en-us/help/2999226/update-for-universal-c-runtime-in-windows