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While the desire to download a "Windows 10 1603 (1607) ISO repack" is understandable for specific performance needs on older hardware, the security trade-offs are too high. A "repack" is a black box of potential security threats. If you see a download for "Windows 10
If it's for compatibility with legacy software or drivers, consider running it in a VM instead of on real hardware. windows 10 1603 iso download repack