A: You can install without a key (click "I don't have a product key"). You'll have a 30-day trial. Enter a valid Windows 10 Pro key later to activate.
Avoid third-party ISO download sites unless you verify checksums. The static links provided above are safe, verified, and hosted on the Internet Archive for long-term access. Windows 10 Pro Iso Download LINK 64-bit Direct Link
After downloading, use PowerShell (Admin) and run: A: You can install without a key (click