Rocket.chat update

I have version 3.5.3 installed through app center.
I get notified inside rocket.chat that version 3.7.1 is available.
How do I upgrade this? I see no version update through app center.

The upgrade is not available this time. Bad thing. Because 3.5.3 is absolutly broken with ldapusers.

Yeah, well that thing among others inside RC as well. I am not gonna make a full rundown of issues that has already been fixed by updates to RC.
So the real question then becomes if there is a guide or even better, a script, to install RC with integration to UCS, but without the app center all together, if there are no apparent plans to push the update through app center anyway.