XRay Express (also known as Starter Pack) is configured to make updating very easy. The key to making this successful is to have used the run folder and scripts provided so that no changes are made in the distribution folders directly.
For example, to install the most recent version of the streams engine.
First, download the latest release version, or snapshot, that you want to use into the XRayExpress folder.
Next, unzip the contents there (using the OS specific commands) so you now have 2 folders, the original tnt4j-streams and a new version such as tnt4j-streams-1.11.1.
Next, stop any streams using this installation.
Once all stopped, rename the original folder to tnt4j-streams-save and then rename tnt4j-streams-1.11.1 to tnt4j-streams.
Upgrade is now complete.
The process would be the same for tnt4j-streams, tnt4j-stream-jmx or tnt4j-streams-syslogd.