this was posted by someone else:

Consistent 11023 error Unable to access server for version

From 3:30 PM PST to now I am getting a constant 11023 error Unable to access server for version. Check (4:20455,10009,19900,12152)

Ok, found a way to get it to work.

Currently using ESET AV (but will most likely work for any AV you are using with the following option), I went in and disabled the option to Enable HTTP Checking. Once I turned it off, the patch was able to download. This is the first time this has ever created a issue, so not sure what has changed.

not sure if it works for you.. but wont hurt to check