Too bad that the game just updated to an entirely new version called Guild of Dungeoneering Ultimate Edition and the trainer is still retired 🙁
Apologise for the inconvenience the retiring of this game has caused. I do not know the reason foe the game being retired. Also sadly there is no long a system in place to bring back retired games.
Looking at the DB the trainer would have probably stopped working correctly from the 27 June 2017 onwards. 14 October 2020 was another update, a string of updates in August 2021 and so far two in November there. Judging in relation to the Ultimate Edition that was released.
Since there is now an Ultimate Edition this may require a new game request.