Trusted archives like Uptodown and OldVersion.com maintain historical 32-bit versions. Essential System Requirements (Legacy 32-bit) Legacy version downloads - FileZilla Forums
If you are running a 32-bit operating system like Windows 7 (32-bit) or an older Windows Server edition, the standard download page at FileZilla-Project.org will typically offer only the 64-bit installer. filezilla ftp server 32 bit download
The 0.x series was the last to officially ship 32-bit binaries. These are often hosted on the official download archive for historical purposes, though they are provided without support. Trusted archives like Uptodown and OldVersion