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Due to substantial technical changes, ZDU is not supported for upgrading from any previous version to 24.4.0.

ZDU is not supported either for a first upgrade from a version lower thatn 24.0 to and Automic Automation version that supports Unicode / UTF-8 (24.0 and higher).

There are significant DB schema and AE message changes that cannot be supported in compatibility or rollback mode. Furthermore, the AE database UTF-8 migration process requires a downtime so that all data is migrated correctly. This step is relevant to avoid an encoding misalignment resulting in corrupted data.