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If your existing installation is older, and you think upgrade is necessary(check the release note first), then you can just run the upgrade package on the machine where the existing DualShield is installed. During the upgrade process, the service will be stopped, so please allow 5-10 minutes service downtime.
Note: The service downtime could extend to 15-20 minutes if you have large number of DualShield audit log. It could take 15-20 minutes for SQL to update tables. You can monitor this via the CPU usage of MySQL process in the task manager.
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