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Here is the installation how-to as pdf in english, version 0.4: installation-how-to
Here is the installation how-to as pdf in spanish, version 0.4: Breve descripción de CryptoSMS.org y Guía de instalación

Here is the user documentation as pdf in english, version 0.3: user documentation
Here is the user documentation as pdf in spanish, version 0.3: Documentación de CryptoSMS.org