Hyperion Essbase 21c is planned for 11.2.15

 Please be advised that:

• Current plans call for Oracle Hyperion Enterprise Performance Management (EPM) System release 11.2.14 to be the last release to embed and certify Essbase 11.1.2.4.
• Current plans call for Essbase 21c to be embedded with EPM System release 11.2.15. It will be the only Essbase release certified with the EPM System.

I am also involved in recent projects that migrate EPM 11.1.2.4 to EPM 11.2 and at that time latest version was 11.2.12 and since 11.2 requires out-of-place migration and I wanted to migrate to the latest possible version on the new servers, I had to check what was the supported path to get there. Every patch mentions this in the release notes.

For 11.2.12 I had to install 11.2.8, install all the patches and then apply patch 11.2.12 (11.2.13 is the latest version now). You can always update 11.2.8-14 to 11.2.15 in the future. In practice what this hints is that moving forward, to install 11.2.16 or later, when they become available, you will need at least version 11.2.15.

When the installer of the full installation runs, you will just need to choose apply update instead of new installation. In my case it's inhibited since I didn't have any prior version installed.