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you don't use optach to upgrade your database , Please Read the below Document That describe usage of Optach
You Must have patch Number : 10404530 which can be downloaded from https://support.oracle.com
Upgrade 126.96.36.199 to 188.8.131.52
Opatch is not for the version upgrade but OUI is! And in 11.2, the upgrade method is actually out of the box which means for going to 11203 from 11201, you don't upgrade the existing oracle home. Oaptch is meant for one-off , BP and other such things. Are you sure that you know how to upgrade the 11.2 to 11203 and have read the upgrade guide/readme file from the docs/MOS ?