WHMCS 5.1 to 5.2 Upgrade

Is there a guide for upgrading from WHMCS 5.1 (5.1.14) to WHMCS 5.2 (5.2.13)? I can't seem to find anything, am I missing it?

Or is the upgrade just a simple drop in? Unzip the 5.2 files over top the 5.1 files?