Uninstall parts from the basic installation as preparation for the following patch installation.
If you upgrade from version 18.5, the rollback patch number would be 28790647.
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Open a Command Prompt window as an administrator.
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Set local variables:
set ORACLE_HOME=C:\oracle\18c_Sta\db
set PATH=%ORACLE_HOME%\Opatch;%ORACLE_HOME%\perl\bin;%PATH%
set PERL5LIB=
net stop msdtc
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Navigate to the folder where you extracted the Oracle Patches, for example
cd C:\tmp\29124511
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Uninstall Patch 28267731
Opatch rollback -id 28267731
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Type Y to continue.