The PC version of SketchUp Pro requires the Microsoft .NET Framework 2.0 (1.1 for SketchUp 6). During install, SketchUp will detect if the correct version of the .NET Framework is missing and will prompt you to download and install the package. Click the "Yes" button to install the package. Due to file size, we suggest downloading the .NET Framework using a broadband connection or faster. If you're using a dial-up connection, please be aware that downloading will take some time.
At this time, SketchUp Pro is only compatible with version 2.0 of the .NET Framework. If your computer has a different version installed, you'll still be asked to download version 2.0. Multiple versions of the .NET Framework can co-exist on your computer without interfering with SketchUp Pro.