Run Acrobat XI Pro with CC subscription
Acrobat XI Pro is no longer available in the Creative Cloud app. All I can do is uninstall DC. It turns out I need it for a short time.

I found a download here, but it says it requires a serial number, which I do not have, because XI was included with Creative Cloud.
https://helpx.adobe.com/download-install/kb/acrobat-10-11-downloads.html
How can I run Acrobat XI without a serial number but with a CC subscription?
And might I ask why Acrobat XI is not available through CC? Is that a mistake?

