The article quoted (http://community.mega.com/t5/Technical-Product/XMI-import/m-p/8107/highlight/true#M1121) is valid for HOPEX V1R1.
This XMI import feature was compatbile with XMI 1.0 and with product (MEGA Designer - Development, MEGA Designer - Integration, MEGA Database Designer) that are not longer available with HOPEX V1R2.
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Note that in standard HOPEX installation a certificate is installed with expiration on 3rd of February 2020. If your installation cease to work, please have your administrator sign-in and download the new certificate. Thank you for your understanding. Download Certificate+