Upgrading the Citrix Integration Service
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If you are upgrading from v7.8 or later, simply create a new Citrix Integration Service installation package and run it on the Citrix server. You do not need to uninstall the previous version of the Citrix Integration Service first.
If you are upgrading from v7.7 or earlier, follow the upgrade instructions v7.8.x to v8.3.x first. Once your deployment is at v8.3, you can upgrade to v8.5 or v8.5.3. Upgrades to v8.5.4 are supported only from v8.4, v8.5, or v8.5.3. (Note that upgrades from 7.8.x or v8.0.x to v8.5.x are not supported.)