As a final resort, the source code is available on third party servers, and there’s nothing on our servers that is really needed to decrypt any files as long as you know the original password used.
We’ll be implementing a simple way to achieve this soon as well in the main distribution, see https://bitbucket.org/axantum/axcrypt-net/issues/60/support-offline-registration-and-key-pair . The main challenge is how to make this both safe, and also not the standard since we’re seeing so many benefits in having real, verified email-addresses. For one thing, support is working much better!
Also, the key pair mentioned in the issue is a convenience, it’s not *required* in order to actually decrypt files.