You can use the key file(which was used to encrypt a file) to decrypt the encrypted files.
Unfortunately, If you do not have the key file, sorry to say, you can’t decrypt the encrypted files which are all encrypted with the key file. That’s the way AxCrypt is designed.
Still, you are facing any issue, please provide detailed information about the issue and write a mail to firstname.lastname@example.org. We are happy to help you.