Greasy Fork is available in English.
A utility to grab and compile chat histories, for parsing, archiving or viewing in an accompanying WIP chat history viewer.
< Feedback on Amino Chat Grabber
edit, this still works however extremely long chats do NOT work very well for archiving
It isn't maintained, no, but it should still work. The issue is that after some time you will get rate limited, as you've found. You can preload the chat to grab it all in one go, or you can increase the delay in the script.
just a question, is this still maintained? I'm struggling to archive some of my long-gone amino chats