Did upgrade to .2233 via a clean install.
But in order to do that, had to download full installer at beginning of topic.
After eight tries, was successful in downloading a full complete copy of AIS. All other copies were corrupted at the end of the download and all were tossed.
I see where bob3160 is getting Host Unreachable error when attempting to upgrade within gui; looks as if similar issue, if only as a network connectivity issue?
Firefox 40.0.3 still reporting AOS add-on as unsigned.