Available with Business Analyst license.
The Business Analyst Desktop setup package is designed to detect an existing installation (10.6 for example) and prompt you to uninstall the older version before upgrading to 10.6.1.
Prior versions (or vintages, i.e. 2016 Data) of local Business Analyst Data can remain installed when upgrading to the most current vintage (2017 Data). To switch between vintages, open the Business Analyst Preferences > Dataset tab and toggle to the desired year under Current Dataset.