ARIS UML Designer 10 supports UML 2.5. UML 1.4 content created with ARIS UML Designer 7.x must be migrated to UML 2.5 before it can be used by ARIS UML Designer 10.
The first chapter Running the UML Migration shows how the UML migration can be started and which options are provided to the user.
The chapter UML Migration Basics describes how UML 1.4 elements and diagrams are migrated into UML 2.
UML 2 is not 100 % backward compatible to UML 1.4. The chapter UML Migration Details describes how most of these incompatibilities are solved automatically by the UML migration and which parts of a UML 1.4 model should be adapted manually in ARIS UML Designer 7.x to avoid the risk of data loss by the UML Migration.