If a 700MB Windows 10 ISO sounds too good to be true for everyday use—it is. Size isn’t everything; security and reliability matter far more.

Use the official Microsoft Media Creation Tool. Buy a cheap 8GB USB flash drive. The full 3.5GB ISO is slower to download but infinitely safer, more stable, and fully functional.

Look only at well-known, open-source projects like Tiny10 (by NTDEV), verify hashes, and never use it for banking, shopping, or accessing personal accounts. Ideally, keep that machine offline.