Today BOH receives the 18th free update, a massive update that closes its almost 11 years long development life, brings new features, new missions (for a total of 100!), and countless other improvements, and earns the game the ADVANCE tag.
The current owners of a copy can download the updated version for free.
The update is performed by installing the new version over the old one using the supplied installer.
https://retream.itch.io/boh
https://retream.itch.io/boh/devlog/26867/boh-advance-released
Enjoy!