Since the 32-bit version does not work with the modern Unity Hub, you must install it as a standalone application. : Navigate to the official Unity Archive. Select Unity 5 : Click the tab for Unity 5.x . Choose 5.6.7 : Find the version 5.6.7 (released in 2019).
: These older versions can typically be installed and run as standalone applications without needing the modern Unity Hub Unity Discussions Licensing and Costs Unity remains free for beginners and small developers: Unity Personal Unity 3d 32 Bit Download Free
If you specifically need a 32-bit version for legacy hardware or projects: a direct link and instructions to download Unity
For a visual walkthrough of locating the 32-bit editor in the archive, you can watch this guide: Visit the Archive Since the 32-bit version does