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Hello Arnaud,
Yes, you are essentially right when you say: “I could read the documents that she sends (shared passphrase) me but I could not send it to her“. The reason is that AxCrypt 2 stored encrypted data differently than AxCrypt 2, among other things in order to make the format more robust.
I suggest you ask why the other party is unwilling to upgrade. We no longer support or maintain AxCrypt 1, even if it is available still.