You do not need to search for pirated versions. Foundry now provides a public license file that is valid until . This license works for Modo 17.1v1 and earlier versions, including the 16.0v3 version you mentioned.
: Publicly available instructions on the Foundry Learn site explain how to apply the extended license for individual workstations. Modo 16.0v3 Overview
: Installers for various versions (Windows, macOS, and Linux) are available through the Foundry Downloads page .
: Native support was added later in the 17 series; version 16 runs on M1/M2 chips via Rosetta 2 emulation. Important Compatibility Notes Foundry winds down Modo development