This is the biggest risk. These files are often "clickbait" designed to get you to disable your antivirus so a Trojan or miner can slip onto your system. The Risks of Using "Highly Compressed" OS Files
No. YouTube videos can be faked. Many use virtual machines or edited screenshots. Some provide a download link that is malware. Never trust such videos without verification. Download Windows 7 Highly Compressed In 10mb Iso File
A small 10MB executable that, when run, attempts to download the full 3GB+ files from another server. This is the biggest risk
Use a valid product key to download from Microsoft. Download Windows 7 Highly Compressed In 10mb Iso File