While doing upgrade to 19c, dbua getting failed during netca listener creation in windows with following error
TNS-12557: TNS:protocol adapter not loadable
TNS-12560: TNS:protocol adapter error
TNS-00527: Protocol Adapter not loadable
Before you start DBUA, please check the windows oracle_home & tns_admin environment set with old home & tns admin path. remove the old path from environment variables and start with 19c oracle home & path.