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You likely modified your PATH and RAYPATH environment variables (adding "/usr/local/radiance/bin" to the former and "/usr/local/radiance/lib" to the latter), and may have added "/usr/local/radiance/man" to your $MANPATH, so you'll want to clear those out as well, or update them if you're installing Radiance to some other location. These env vars can be modified in a number of places, usually on Mac it's done in ~/.profile or ~/.bash_profile. I ASSume you know how to exit these "hidden" files, since Radiance wouldn't have worked if you hadn't made these mods in the first place, but let us know if you need further help! P.S. If you're just wanting to upgrade to a newer version of Radiance, you can simply install a newer version right over this one. HTH That version number tells me you used the NREL installer, and the location tells me you installed it to the default location, so from a command prompt, type exactly this: "sudo rm -rf /usr/local/radiance", and enter the admin password when prompted. You likely modified your PATH and RAYPATH environment variables (adding "/usr/local/radiance/bin" to the former and "/usr/local/radiance/lib" to the latter), and may have added "/usr/local/radiance/man" to your$MANPATH, so you'll want to clear those out as well, or update them if you're installing Radiance to some other location. These env vars can be modified in a number of places, usually on Mac it's done in ~/.profile or ~/.bash_profile. I ASSume you know how to exit edit these "hidden" files, since Radiance wouldn't have worked if you hadn't made these mods in the first place, but let us know if you need further help!