However, for 99% of users, using such an ISO on a daily driver or internet-connected machine is a security catastrophe. Microsoft has moved on, and so has the ecosystem of software and drivers.
Windows 10 version 1507 (the original 2015 release) is no longer officially provided as an updated ISO by Microsoft for general consumers. Support for the standard Home and Pro editions of this version . Current Status and Availability
Windows 10 1507 is bound by the same licensing as any Windows 10 version. You cannot activate 1507 with a Windows 11 key unless it’s a generic channel key for evaluation.
If obtaining an ISO from a third-party, it is critical to verify its integrity by comparing the SHA256 hash against known values from the official Microsoft Documentation to ensure the file hasn't been modified. Summary of Version 1507 Release Date July 29, 2015 Build Number Current Status Unsupported (except LTSC 2015) ISO File Size Approximately 4–5 GB