I just downloaded a file from there; it's the first time is about a year I've been able to. Might want to check yours as well?
It has never stopped working for me. I use it weekly.
I agree, if you want it to work all the time, you have to contribute. I've added schematics and owners manuals every year, same with vinyl engine.
Glad to hear this. It was down in May, and they said they were working on it. I’ve used it (and contributed) successfully for years until the May fail.