As noted by users on Quora, a fully functional 64-bit Windows 10 Pro cannot be compressed to an extremely small size (like 100MB) without removing core files.
Sites like often provide direct links to the official Microsoft servers, allowing you to download the 64-bit ISO directly without the tool.
Instead of downloading a risky compressed file, you should download the official ISO and then use trusted tools to "debloat" or trim it yourself.
When searching for a reliable source to download Windows 10 Pro, you'll come across various websites offering compressed versions. Here are a few popular options: