To understand why you are looking for this specific ISO, it helps to look back at the hardware context. The "HP Compaq" branding was prominent during the Windows 7 era (2009–2014). These machines—the Compaq Presario CQ series, the HP Compaq dc7900, 6000 Pro, and 8200 Elite—were workhorses designed for enterprise environments.

of using legacy software or perhaps pivot the essay toward the history of the HP-Compaq merger

A minimum 8GB USB flash drive or a blank DVD-R disc.

The safest path is:

: Some users on the HP Support Community suggest using the "Heidoc Microsoft Windows and Office ISO Download Tool," which can sometimes still generate links for COEM (Commercial OEM) versions that are compatible with HP keys.