It is strictly unsupported legacy software . Steinberg does not list it for individual purchase on their official products page .
A General MIDI (GM) compatible sound module containing over 70 MB of high-quality (for its time) instrument samples. Steinberg Universal Sound Module v1.1.2 [WiN]
Since USM is a 32-bit VST, you cannot use it directly in modern 64-bit DAWs (like Cubase 14/15) without a "bridge". It is strictly unsupported legacy software
You would need software like jBridge to run this 32-bit plugin in a 64-bit environment. Since USM is a 32-bit VST, you cannot
While no longer for sale, Steinberg sometimes offers legacy content or "VST Classics" for free to existing users in their unsupported software section .
Virtual Instruments & Sample Libraries - Steinberg
The is a legacy virtual instrument (VST) that was originally bundled with older versions of Cubase (such as Cubase VST 5 and early Cubase SX). Because it is a discontinued "legacy" product, it is no longer sold as a standalone piece of software and is not officially supported on modern 64-bit operating systems. Summary of the Software