Oracle XE21C and RHEL8 preinstall rpm wrong address

In case you are wondering why you can't download oracle database 21c preinstall file for Red Hat Linux 8 (RHEL8) using the instructions given in the documentation, the reason is quite simple, it's in a different repository.

Oracle Installation guide for XE21c says to download the preinstall file from here:

https://yum.oracle.com/repo/OracleLinux/OL8/latest/x86_64/getPackage/oracle-database-preinstall-21c-1.0-1.el8.x86_64.rpm

however the file is here:

https://yum.oracle.com/repo/OracleLinux/OL8/appstream/x86_64/getPackage/oracle-database-preinstall-21c-1.0-1.el8.x86_64.rpm

An attempt to download from the wrong URL will create a file containing a few bytes of garbage.

The URL for RHEL7 seems to be good instead (I mistakenly downloaded the file for RHEL7 at the beginning).

It's somewhat frustrating to see how people move things around lightheartedly after that the documentation has been published.

Hope it helps