This article shows you how to troubleshoot a failed installation of SQL Server and how to implement a workaround to allow SQL Server 2017’s PolyBase feature to be installed when version 9 of the Java Runtime Environment (JRE) is present. An installation of all features in SQL Server 2017 has three external dependencies. Python, R, and the JRE are third party or open source software needed in a full installation. Changes to external software after the release of SQL Server 2017 can introduce breaking changes. Oracle, the company that owns Java, changed how Windows registry keys are named. This caused a breaking change for SQL Server 2017. Version 8 of the JRE is compatible with the SQL Server 2017 installer. Version 9 of the JRE is not. If version 9 of the JRE is the only version of the JRE on a Windows machine, it is not possible to install the PolyBase feature. The JRE version bug also is found in the SQL Server 2016 installer. The same workaround works for both SQL Server 2016 and 2017.