Have you tried to follow the steps in my reply please?
Navigate to Settings - Supported browsers and check if Chrome is listed as "Installed". If it´s not installed, install it by pressing the "Install" button. If it's installed, uninstall it by pressing the "Uninstall" button and then reinstall it by pressing the "Install" button".
Do you get some message when you are trying to install the plugin? Please make sure to close all Chrome windows and chrome.exe processes in the Task Manager when installing the plugin.