Tutorial for creating and testing a 700MB Windows 10 ISO - NTLite
Standard Windows 10 often uses 2GB+ at idle. Lite versions can drop this to under 1GB, sometimes as low as 400MB-900MB. Windows 10 Ultra Lite Iso Download 32 Bit
If the risks of custom ISOs are too high, consider these official alternatives that run on 32-bit hardware: Tutorial for creating and testing a 700MB Windows
Because the bloat is removed, the requirements are incredibly low: You must have a true 32-bit CPU or
Note: You cannot install this on a 64-bit CPU in 64-bit mode. You must have a true 32-bit CPU or a 64-bit CPU that supports CSM/Legacy boot for 32-bit EFI (rare on modern PCs).
And if you found this guide useful, consider donating to the original developers (Ghost Spectre, X-Lite) who spend hundreds of hours creating these tools—not to the website reposting their work.