Disclaimer: This article is for educational purposes only. Downloading or modifying Microsoft Windows operating systems from unofficial sources carries significant security risks (malware, rootkits, data theft) and legal risks (violation of Microsoft EULA). Users are strongly advised to download official ISOs directly from Microsoft servers.
Boot from USB: Restart your PC, enter the BIOS/Boot menu, and select the USB drive. highly compressed windows 10 iso file download link
Instead of hunting for a shady "highly compressed" link, use Microsoft's UUP Dump (Unified Update Platform) or the Media Creation Tool to generate an ISO that you can compress yourself. Disclaimer: This article is for educational purposes only
Conclusion from Tests: The absolute smallest functional Windows 10 installation that can still boot and run the setup process is roughly 1.5 GB to 2 GB if you strip out all drivers, languages, fonts, and non-essential components. Any claim of a 200 MB Windows 10 ISO is a mathematical impossibility unless the file is either: Functionality: These are not full versions of Windows 10
Stability: Removing system components can cause "Blue Screen of Death" (BSOD) errors.