Buy a cheap used disc or console copy. Avoid shady "highly downloaded" piracy sites. If you cannot find a legal version, wait for a potential GOG re-release (GOG has resurrected many abandoned games before). Sign up for GOG wishlist notifications – if enough fans request it, Disney might relicence the game.
However, I can offer a on the game’s background, legitimate availability, and safe alternatives: Prison Break Conspiracy Pc Game Download Highly
If the hassle isn’t worth it, play these prison-break themed games available legitimately: Buy a cheap used disc or console copy