Hello Bernard MARTIN,
AxCrypt 1.x and 2.x are compatible in the sense that 2.x can open all files secured with 1.x.
If you open files encrypted with a different password than your sign in password, which often is the case directly after upgrading to version 2, you will be prompted for that original password. If the file was encrypted with version 1, it will then be automatically upgraded to version 2 and to use the new sign in password which means you won’t be prompted again for the old password.
If you think you almost know the password, we have simple software allowing you to try to find your password, and you can download the most recent version from https://account.axcrypt.net/Download/AxBruteForce.exe and read of how to use it at https://www.axcrypt.net/axcrypt-brute-force/ . Please note that we cannot provide support beyond this.
If you do not remember the password to your account, you can always reset it. This is not a way to recover encrypted files! It’s only to allow you to sign in to the AxCrypt app and web.