Yes, as per subject CIS version 12.2.2.7062 stopped updating about a month back. Viewing the update screen shows all related items had errors. Thinking that CIS had become corrupted in some way, the application was fully uninstalled, first with CIS uninstall and then with CIS x64 clean up tool. So far so good. Note that no other software had been installed apart from regular CIS updates.
Reinstall of latest(?) version 12.2.2.8012 fails almost straight displaying Comodo red screen message “Failed to initialize installer. Please check your internet connection and/or Internet Explorer connection settings. Error:12002. The operation timed out. OK” . As a check I tried re-installing 7062 but fails in just the same way.
Now, the internet connection is working as have been able to access the Comodo forum and had a successful ping of the update server. Firewall disabled. I am also able to install other software. OS is Win7 Home Premium x64 SP1.
UB
I suspect that you have assumed incorrectly - particularly given that you can successfully install the offline installer but it fails as soon as it needs a connection to a Comodo server for updates.
I would be wiling to bet that you still have the beta servers details in your \windows\system32\drivers\etc\hosts. file.
Please double check and remove any entries to the Comodo servers (if present).
Can you ping the download server from your work PC (when tethered to your iPhone)?
Can you ping the download server from your iPhone?
Steps 1 and 2 will help expose where the blockage is occurring but there is the chance that the problem lies within AT&T (but there are no other reports similar to yours).