Try Message Board bundled plugin (/vendor/elgg/mod/messageboard)
The "Send Private Message" widget is not available in a default Elgg installation. It's provided here on the community site by a custom plugin (https://github.com/Elgg/community_customizations). In a default Elgg installation the Messageboard plugin would provide a similar widget - though in this case the posted messages would be publically visible on the profile pages.
On a default Elgg site the sending of private messages can be initialized either from the profile pages of users or the hover menu of user icons by the "Send a message" option. The Private Profile plugin also hooks in here to check if a user is allowed to send another user a private message. I don't know if the Private Profile plugin would also work flawless with the "Send Private Message" widget to prevent sending of unwanted private messages. It might not send the message in the end but it might still display the widget at least also on profile pages of users where the visiting user is not allowed to send messages.
Advanced Stat plugin from https://elgg.org/plugins/1148004? The versions offered there seem not compatible with Elgg 2.x. But you might want to download the plugin from https://github.com/ColdTrick/advanced_statistics as there seem to have been some updates made in the code that make the plugin compatible with Elgg 2.x (though I can't say if the work has been finished yet).
Thank you iionly for for your suggestion. I did download the latest build from github and it works fine. To let anyone know who reads this, I am using PHP 7.0.8-FPM and Elgg 2.2.3.
Javascript is all client based, you don't need anything installed on your server for it to work.
It would be really helpful to debug if you have something like firebug installed in your browser. Activate it, load your webpage and if there are one or more red balloons popping up in firebug, see what the errors are in the console.
Do you have ONLY hypewall and dropzone installed as third-party plugins? If not, it could be virtually any plugin causing an error. This error might preventing other javascript to execute properly
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