If you’re reporting bugs, please have the latest copy of Anura (our engine). Instructions to do this are as follows…
You can download nightly builds of Anura here, and you can get Frogatto from here. Anura’s an engine that can run a number of different games besides just Frogatto, so what you’re getting when you download Frogatto there is a “module” - a self-contained folder of all the game-data/art/etc to run a certain game on top of Anura.
Drop it in Anura’s modules folder and you should be able to run.