Genymotion Desktop relies heavily on hardware, OS, drivers, and virtualization technology. The x86 32-bit architecture is now obsolete. The x86 32-bit architecture has limitations. The limitations do not meet requirements to virtualise modern Android versions (7.0 and above).
For that reason, Genymotion does not provide any Genymotion Desktop for 32-bit systems.
What are Genymotion Desktop requirements?