Performing an upgrade using a new $NH_HOME ($NH_HOME_B) when a different $NH_HOME ($NH_HOME_A) previously exists, fails with the following error message (from $NH_HOME_B/tmp/<date and time>-ORACLIENT.log):
SEVERE:OUI-10137:An Oracle Home with name EHORA10C already exists at location $NH_HOME_A/client. Please specify another name for Oracle Home.
Here are the steps to reproduce the issue:
When upgrading the Oracle Client, you must use the same upgrade directory that you used previously. Do not create multiple upgrade directories for the same version upgrade. If you use a different directory, you may receive an Oracle Client installation problem.