Correct me if I am wrong, but this is the first time you noted the 8920,208 error massage. That gives us more information to work with.
If you use a proxy, check your proxy settings are correct.
Reset Winsock (In cmd with Admin Rights-> Type netsh winsock reset) -->Restart PC-->Run Live Update
Clear your DNS cache. See https://www.whatsmydns.net/flush-dns.html
Obviously you will want to try this after your presentation, so let us know if any of this helps.