: Always verify the SHA-1 checksum of files downloaded from third-party archives to ensure they haven't been tampered with. 3. Purchasing a License
Since Microsoft no longer sells Windows 7, you cannot buy it directly from them. buy windows 7 download
For users who need a copy for virtual machines or historical testing but lack an easy-to-access portal, the (archive.org) hosts verified "untouched" ISO images. : Always verify the SHA-1 checksum of files