You are installing F/X CAD, and you're unable to see your letter drive for the LandFX folder when attempting to browse to while the F/X Workstation component is installing.
1. Uncheck the F/X Workstation option while installing F/X CAD.
2. Follow our steps to download the latest Land F/X Workstation installer (setup_FXWorkstation.exe) and run it from your LandFX folder.