Extract installation package of new version to a new directory.
Open a command line window, and switch to the bin sub directory under the new version's installation directory. Run the migrate command to migrate from previous QuickBuild version. On Windows platform, the command is migrate.bat <install directory of previous QuickBuild version>, and on unix platforms, it will be migrate.sh <install directory of previous QuickBuild version>.
Start QuickBuild server in new installation directory.
If you've configured build agents, re-install build agents following below steps:
Backup the file conf/attributes.properties under build agent's installation directory.