How To Update a Mendix Version
This tutorials shows a new Mendix version can be installed. To be exactly you can install a dozen Mendix version without destroying a previous release. What you need is the mendixrelease.tar.gz that can be provided by Mendix.
Upload the mendixrelease.tar.gz to the folder /usr/local/share/mendix/ and extract the .tar.gz file by issuing tar xvf mendixrelease.tar.gz. Your new Mendix version has been installed.