Thank you for developing and providing this software, @GM Manga.
I'm experiencing the same symptom as @Avengerbot and @Eugirdor. I'm using the current https://islandrum.powermad.net/mac-installer.zip under macOS Sonoma version 14.4.1. I've provided a screenshot below. I've let this sit for over 15 minutes on 2 separate attempts and the operation seemingly hangs every time.