Some Windows 8 versions do not allow automatically to install OBDuCAN without activating formerly the « .NET Framework 2.0 ».
Here is what you should do to activate it:
Open the Control Panel and select Programs
Chose Programs and features
Click on Turn Windows features on or off
Tick: .NET Framework 3.5 (included .NET 2.0 et 3.0)
At this stage, Windows will ask you to accept to download the feature from the Microsoft website; accept to download and then to install the « .NET Framework 3.5 ».
When it is done, you can install OBDuCAN!