UNable to upgrade to 5.4 on Windows

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The release notes for 5.4 GA show that an upgrade from 5.2 or higher is supported. I"m getting a "must uninstall previous version" error when trying to use the MSI. I have a TAC case open but was curious if anyone else was seeing this. It kills a GPO method of distribution.

-rd 2x 200D Clusters 1x 100D

1x 60D FortiOS 5.2 FortiAP 221C FAZ 200D

-rd 2x 200D Clusters 1x 100D 1x 60D FortiOS 5.2 FortiAP 221C FAZ 200D

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