There isn't one. The elementary team dropped it for a couple reasons. 1. They couldn't guarantee performance on very old 32bit machines 2. There wasn't a large enough demand to support it
Although there are still many 32-bit machines, it is still possible to install the 64-bit elementary on these machines. If this computer has a dual core processor with 2 Gb of memory it is acceptable to install a 64-bit version.
No worries. You can install 32bit OS and apps on a 64bit machine. That can be done. But not the other way around
Just in case there are others out there that aren't experts.....I was confused about X86. When I wanted to test drive Loki, I installed it on an ancient Toshiba that is labeled as X86...........so, I thought 32 bit. I was shocked when it ran flawlessly. When I dug deeper with lscpu, I found it is actually X86_64....32 bit processor / 64 bit architecture. Just saying....glad I gave it a try. I have no idea why it was labeled that misleading way in the Windows 10 system nfo....but, there you go......WINDOWS. LOL. So double check your specs before you give up.