You will be forced to run Windows Update immediately after installation, downloading gigabytes of data to make the OS secure—or worse, the OS will automatically update to the latest version (e.g., 22H2), effectively defeating the purpose of installing 1507.
Windows 10 Version 1507, codenamed "Threshold 1," holds a unique place in computing history as the very first public release of the Windows 10 operating system. Launched on July 29, 2015, it marked the beginning of the "Windows as a Service" era. windows 10 version 1507 iso updated