APSB20-68 for Adobe Creative Cloud Desktop application - how to apply?

Hello,

I have Adobe Creative Cloud app installed on my Windows 8.1 Professional (x64) system.

I am running version 5.2.1.441 of ACC -- which, ac. to the Adobe ACC release notes, seems to have been released 07/30/2020 (mandatory release)

I see that on 10/20/2020 Adobe released the APSB20-68 Security update for Adobe Creative Cloud Desktop Application.

They say APSB20-68 applies to version 5.2 -- and that the updated version is 5.3

Here's the glitch: when I do a Help :: Check for Updates in ACC it says there are no updates available.

How can this be when the APSB20-68 writeup say that version 5.2 contains a "critical vulnerability that could lead to arbitrary code execution"

How come ACC tells me their is no update available?

Thanks.

-RD