Pluck update

Welcome to the pluck upgrading script. This script will help you upgrade your pluck to the newest version, 4.5.2.

This step will perform some checks that will verify that you uploaded the new files alright.

We checked your installation, and it appears some files are missing. You can try to perform the upgrade, but probably you will lose (some) data. Please also note that the upgrade will only work with version 4.3 or newer.