When updating, it's advisable to update Management Console first, then Tracker and then Agents.
Upgrade to v2.2. requires new license, current licenses are not supported. Contact your sales representative to get new license and link to download page. Each license may or may not have new features introduces in v2.2.
It's advisable to stop the running instance before updating.
Upgrading Management Console:
Download the msi for Windows and launch. Follow the installation wizard steps and select the current installation path.
To update Console on Linux, fetch the archive and unpack it to the directory where srvctrl is currently located replacing all old files.
Resilio Connect v2.2 automatically installs tracker on the same node as Management Console. If you already have a custom tracker configured, agents will keep using that. To update the tracker, download the installer for Windows or binary for Linux. Install it to the same location on Windows, or replace the binary on Linux.
Download the installer - msi or dmg - and launch on Windows or Mac. To upgrade on linux, replace the rslagent binary in its directory. If prompted to select account for agent in Windows - Local System or Local Service - select the one which is currently being used.
To upgrade agent on a NAS, download the appropriate package and from package manager through manual installation option install the package.
Remote upgrading of agents (apart from on a NAS) through distribution job is also possible, guide is here.