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Upgrading from v9 to v12.1

Question asked by Anicet_TAGNE_10259 on Mar 19, 2018
Latest reply on Mar 19, 2018 by Wolfgang_Brueckler_1288
I can not find any reference of the conversion v9 to v12 in the document of version 12.1. The oldest version is the v10. How to migrate from v9 to v12.1. Should we necessarily go through an intermediate version, like v11.2 for example?