Since there is no official retail version of Deltarune labeled "32-bit" (the official PC version is 64-bit only), I have developed this guide based on the most common interpretation of your request:
Crashes may occur when entering the "Weird Route" due to additional enemy instances. Recommended to disable that route in 32-bit (or pop up a warning). deltarune 32 bit
The 32‑bit version of Deltarune is for legacy Windows systems. It offers no gameplay differences from 64‑bit. Unless you have a specific need for 32‑bit, just run the default version for your OS. How to run Deltarune on a 32-bit system
Deltarune Chapters 1 & 2 do not officially support 32-bit operating systems. The Significance of 32-Bit fully functional, safe, and