No, we don’t have such a web page. We probably should. There are quite a lot of differences, even if the core function is the same it looks quite different so some old users are a little bit intimidated by the changes. We’re working on new tutorials and a “AxCrypt 2 for AxCrypt 1 users” page.
Yes, you’re right – AxCrypt 1 can’t read AxCrypt 2 files. So you should upgrade both computers at more or less the same time.