Windows 8 has just been released and we will soon be releasing a new version of Shaderlight which fully supports it. In the meantime, the current version of Shaderlight will work with the new version of Windows, but the installation requires a couple more steps.
If you have not already done so, you will first need to download and install the Microsoft .NET 2.0 framework from here
Then when you first run the installer you will see the following message:
Click on the “More info” link and then you will see:
Choose “Run anyway” and the installation will proceed as normal.