The installation won't run
If you can't start the installation, the cause is most likely an incomplete download of the Setup file. Compare the size of the file to the official download sizes, which you can find here. If there is a difference, try deleting the first file then downloading again.
For SketchUp 6 and older, if you can start the installation, but it stops abruptly, the cause is most likely corrupt installation information. The installation process won't overwrite this information, so you'll need to rename the folders that contain it, which forces the installation process to create new folders containing fresh install information.
- Rename this folder, appending a suffix like "BAD" to the folder name:
- C:\Program Files\Common Files\InstallShield
- Restart the computer.
- Run the installation again.