Hello there! I was wondering the same thing. Is it still possible to get a registration for Ambroshia 4.5? Also, I am not sure if I have the latest install file, and I couldn't find any officially hosted install files. Great game by the way!
I'm not sure, I'm glad I did get my key years ago when he was still working on v5.0. I also like to add that I did hear he passed away but I don't know how much of it is true. I believe his son is still giving away keys when you register but also don't know how much that is true as well. Can always try and email the owner.