Canopy 1.5.2 is the last version available for 32-bit Mac OS X. Canopy 1.5.5 is the last version available for 32-bit Linux. The standard ("Express") installers for Canopy 1.5.2 on OS X 32-bit and Canopy 1.5.5 on Linux 32-bit can be downloaded from https://store.enthought.com/downloads/. (For all other platforms, that page provides installers for the current version of Canopy.)
Background: The last 32-bit version of Mac OS X itself was 4 years and 4 major updates ago. We have vanishingly few users on 32-bit Linux.
Therefore, we have determined that our resources are better directed toward enhancing current platforms.