The final Ubuntu-based version of Linux Mint to support 32-bit architecture is . Although this version reached its official end-of-life (EOL) in April 2023, the ISO images remain available through archives and mirrors for legacy use.
If you need a 32-bit operating system that is with security updates, you should look at Linux Mint Debian Edition (LMDE) . Unlike the standard version, LMDE is based on Debian rather than Ubuntu, allowing it to maintain a 32-bit release. linux mint xfce 32-bit iso download
The Linux Mint All Versions page provides a directory of older releases where you can navigate to version 19.3 for direct mirror links. The Recommended Modern Alternative: LMDE The final Ubuntu-based version of Linux Mint to