HP SoftPaq Download Manager (SDM) requires .NET 3.5. Windows 8 has native support for .NET 4.x.
Unfortunately, .NET 4.x is unlike .NET 3.5 where 3.5 contained support for 2.0, 3.0 and 3.5 all in one. In our humble opinion, .NET 3.0 and .NET 3.5 should have been called .NET 2.1 and .NET 2.2, respectively.
Starting with .NET 4.0, Microsoft, is not including backward support for .NET 2.0, 3.0 and 3.5.
Luckily, in Windows 8, the .NET 3.5 Framework is included with the OS. However, it is disabled by default.
To enable .NET 3.5 in Windows 8, follow these instructions:
Bring up the "Control Panel".
Click on the "Programs and Features" icon.
Select "Turn Windows fearures on or off" (located on the upper left of the window.
In the dialog box, check the option ".NET Framework 3.5 (includes .NET 2.0 and 3.0)"
Click the "Ok" button.
The SDM installation should work after that.
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