The 17.00 release is not compatible with 15.10.10.00 or earlier releases. The 17.00 installer will provide the option to remove any pre-15.10.10.00 release found before installing 17.00 or cancel the install.
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Click Install.
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Click Continue to uninstall the previous version and continue with the 17.0 install or Cancel to exit the installation.
Information about the packages removed can be found in the log file: /tmp/TTUInstall17.00.log.