While Undisputed is technically available through unofficial channels, the lack of online play and the risk of malware make the official version the significantly better experience for fans of the "Sweet Science."
Undisputed is built heavily around its online ecosystem. Pirated versions of the game generally suffer from the following limitations: undisputed crackwatch
Using your GPU to mine Monero while you play. Adware: Flooding your browser with intrusive pop-ups. undisputed crackwatch
The official version is optimized for handheld play, which is often a headache to configure with bypassed executables. A Word of Caution: The Risks of "Crackwatch" Searching undisputed crackwatch