Microsoft ended official support for Windows 7 in 2020. Using an outdated, unofficial version means you won't receive security updates, leaving your PC wide open to remote hacking.
Compressing a 3 GB+ operating system down to 9 MB (a 99.7% reduction) while keeping it functional is not possible with current technology. Windows 7 Ultimate 64 Bit Highly Compressed -9.28 Mb
Any file claiming to compress a multi-gigabyte OS into less than 10 MB is almost certainly a scam, a virus, or a non-functional archive. Why "9.28 MB" Highly Compressed Files Are Risks Microsoft ended official support for Windows 7 in 2020