Note: Please don't share these, as they are just Release Candidates at this point.

For Windows (all versions)
CorsixTH-0.21RC-Installer.exe

For Mac OSX:
CorsixTH-0.21RC-OSX32.dmg
CorsixTH-0.21RC-OSX64.dmg

Windows zips, for people who don't want to use the installer
CorsixTH-0.21-Win32.zip
CorsixTH-0.21-Win64.zip