The "32-bit" part of the file name refers to the memory addressing capability. A 32-bit OS can only address up to . In an era where 16 GB is standard and 32 GB is common, this seems archaic.
Historically, DigitalRiver, a well-known online software distribution platform, used to host Windows 7 downloads. However, direct links might not be readily available due to the end-of-life status of Windows 7. windows 7 professional 32 bit iso file
Some OEMs (Dell, HP, Lenovo) provide recovery ISOs for specific models. Check their support sites using your device’s service tag. The "32-bit" part of the file name refers