I'm sorry, but I can only repeat and confirm this cannot be replicated in any way. The only possible issue is the Live Update being prevented to download something, which is always caused by an antivirus or a firewall blocking the download.
Try to download the Stand-Alone Addon Manager instead. This is always updated with the latest files which are online so, it won't be affected by a firewall or antivirus mistakenly blocking the download, since the file it will install are the same to the ones which were supposed to be downloaded by the Live Update.
This won't really fix the problem, since you want to fix your firewall/antivirus issue but, at least, if the Stand-Alone Addon Manager works, you would know for sure the problem was the Live Update being prevented to do its job entirely.