You can have two releases of JADE installed on the same workstation, if the files are in different directories.
If ODBC is installed, only the last installation of the JADE ODBC driver is available from the ODBC Data Source Administrator.
If you install multiple copies of JADE 7.1 on a machine, an initial dialog during the installation asks if the installation should install a new instance or maintain or update the installed instance. You should select the default Install a new instance of this application option.