Once you have downloaded the Unity 5.6 32-bit installer, follow these steps to install it:
Because 32-bit support was dropped in later versions, you cannot find this installer directly on the main Unity download page. Instead, you must use the official Unity Download Archive. Go to the Unity Archive page. Navigate to Unity 5: Click on the Unity 5.x tab. unity 5.6 download 32 bit
Look for version 5.6.7 (the last stable release of this cycle). Once you have downloaded the Unity 5
Let’s dive deep into how to safely download, install, and use Unity 5.6.6 (the final patch release of the 5.6 cycle) for 32-bit development. Navigate to Unity 5: Click on the Unity 5
Also, the Unity 5.6 Editor will frequently try to check for updates or connect to an obsolete license server. Block unity3d.com in your firewall or use the -noupdate launch argument.
If you just need the download link: → Go to unity.com/releases/archive → Unity 5.6.7 (final patch) → Windows → 32-bit installer.