A lot of issues have been fixed in this release, at least for our issues.
Haven't tested it yet but much fixes are touching our issues with standby/windows10 and split domain.
I was able to research this a little.. and found this info..
You cannot directly run 5.2.5-c84 on top of another 5.2.5 because they are the same product id and on the same release.
The only way you can upgrade to 5.2.5-c84 from another 5.2.5-x is to uninstall the old 5.2.5 first, and then install 5.2.5-c84. But if is using portal upgrade, it will be OK.
Further more, if the machine installed 5.2.4 or older release, and run 5.2.5-c84 on top of it, it should be OK. but again, there is always some risk by directly clicking on a msi if you have GP running already, also need be sure the user has the administrative privilege.
Directly click on msi should be only recommended for the initial installation when there is no other GP in the system.
I hope this helps a little
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