We always recommend using the latest version of the IceWarp Server and Remote Administration Console.
The newer patched version uses stronger encryption for the license key, though incompatible with the older versions. However, if your situation requires an older version, you must change the license key. When upgrading to any security patches, the old license is backed up as license.key.old in the config folder.
This means that when performing a downgrade, the backed-up license file must be "restored" by removing the .old extension.
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