Click Download RIO GUI to get the installer. View the README.txt and CHANGELOG.txt for details.
The ZIP installer is a portable version that can be unzipped to your hard drive or a USB stick. The gui is started by double-clicking the rio900.exe file.
The gui must be stopped prior to uninstalling. Complete the uninstall by deleting the folder where you unzipped it to originally.
To upgrade your version of the RIO GUI uninstall the version you have then install the version you want to upgrade to. Even though it is recommended you uninstall first this procedure will work if you install over a previous setup.
Any number of ZIP portable versions can be kept on your system as long as they are unzipped to folders with distinct names.