Believe you will see it if you click the "Download" button from your link, and then select the Oracle Software Delivery Cloud link (where you will type in "Oracle Business Process" in the dropdown).
Here is another way to download Oracle BPM 12.2.1.
Sure that Oracle will fix the download link at some point, but if you accept the license agreement on this page: Oracle BPM Suite Downloads | Oracle Technology Network | Oracle
You can then download part 1 of 2 Oracle BPM 12.2.1 by going to:
You can then download part 2 of 2 Oracle BPM 12.2.1 by going to: