Oracle 21c download
Just for clearification - I was under impression that, Apex is installed in all latest oracle versions but that's not true.. Till oracle database 188.8.131.52, Apex schemas were installed by default. But from version 184.108.40.206 onwards they are not installed by default (that's a good idea) but it come with following supplied versions- . With Database 220.127.116.11 is Application Express 5.0.4.Make sure you have all the OS prerequisites in place by running the 21c preinstall package. On Oracle Linux you can do this by installing the preinstall package. It probably makes sense to update the remaining packages also. yum install -y oracle-database-preinstall-21c. yum update -y.