<p>Windows 8/8.1 systems come with .NET 4 installed, but don&#39;t have the .NET 3.5 features enabled, which are needed to start the MP Installer.</p>

<p>We should let the installer detect the OS and for Win 8/8.1 sytems use the DISM commandline to enable the .NET 3.5 feature:</p>

<p><span style="color: rgb(66, 66, 66); font-family: 'Helvetica Neue', Helvetica-Neue, Arial, sans-serif; font-size: 12px; font-style: italic; line-height: 18px; background-color: rgb(240, 247, 252);">DISM /Online /Enable-Feature /FeatureName:NetFx3 /ALL /NoRestart</span></p>

<p style="color:#222222;font-family:arial,verdana,sans-serif;font-size:1em;font-style:normal;font-variant:normal;font-weight:normal;line-height:115%;">I&#39;ve tested the above commandline on a clean Win 8.1 install and it worked fine. The only note for this is that an internet connection need to be available, or else the user needs the Windows installation disc.</p>