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If there is a problem during the upgrade process of a SQL Instance, then follow these instruction,

Check the archive Summary.txt, which is located at C:\Program Files\Microsoft SQL Server\XXX\Setup Bootstrap\Log directory
The second file that keeps logging important information about the error message is the StatusInfromation.xml and is located in the C:\Program Files\Microsoft SQL Server\XXX\Setup Bootstrap\Log\ YYYYMMDD_HHMMSS\MSSQLSERVER\Datastore directory


SQL Version Folder Number
SQL Server 2017 140
SQL Server 2016 130
SQL Server 2014 120
SQL Server 2012 110
SQL Server 2008, SQL Server 2008 R2 100
SQL Server 2005 90
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