Maya smiled. She opened a text editor and typed a letter to her nephew: “Dear Sam, your first computer is ready. It’s not new, but it’s yours.”
Since 32-bit computers usually rely on older BIOS (not UEFI), you need to ensure your USB creation method is compatible with MBR (Master Boot Record).
If you see LMDE_6_32-bit.iso: OK , you are safe.
Linux Mint All Versions Page (select LMDE 6 and choose the 32-bit option). Archive/Sourceforge Mirror: LMDE 6 32-bit ISO . Linux Mint 19.3 "Tricia" (Legacy/Unsupported)