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 VersionFolder Number
SQL Server 2017140
SQL Server 2016130
SQL Server 2014120
SQL Server 2012110
SQL Server 2008, SQL Server 2008 R2100
SQL Server 200590
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