I cannot help you with installing this update client, because I'm just a user like you. You have to raise a support ticket with Oracle/Dyn support to get a solution for this Dyn software.
However, feel free to use a different DDNS update client for the time being, for example the built-in client on your router, or the software from https://updater.marc-hoersken.de/ until Dyn support provided a solution.
Thanks for the input. I have opened a ticket with Dyn and I am hoping to get an answer from them, but I thought I'd reach out to the community at the same time, in case someone had seen the issue before. I would prefer to stick with the official client as I have multiple host entries I need to update and their interface works well for that.
Fine. If you have multiple hostnames to update, then there is still an alternative solution. You will be using DNS-O-Matic to propagate your updates to your hostnames and services. Also this can be done by Marc's Updater which supports also DNS-O-Matic. You even can get email notifications with this. Maybe an improved solution in comparison to the "official client".
If you can share the ticket number with me I would appreciate it so I can make certain it gets to the right teams. In the meantime, what version of the updateclient are you using? have you tried using an older version? what OS are you installing it onto?
Oracle + Dyn