Windows Update won't connect and hasn't updated since August last year,
Speccy does not show any updates ever having been installed so this has been broken since Installation Date: 9/08/2019 7:18:45 PM
How was this installation done, was it a free in place upgrade from Windows 7 or 8.1 or was it done using a genuine Windows 10 DVD or a downloaded ISO, if an ISO, from where was the ISO obtained, can you answer this for us and then move onto the below.
First suggestion is that you get rid of Avast as it has become somewhat of a monster in that unless you do a custom install Avast foists all sorts of unwelcome extras on unsuspecting users such as browser plug ins that cause connectivity issues, see info below;
Windows 8, 8.1 and 10 come with an improved Windows Defender, it offers the same real-time anti-virus/anti-malware protection as Microsoft Security Essentials. Windows Defender also shares the same malware signature definitions as Microsoft Security Essentials, and Forefront Endpoint Protection. Technically, Microsoft Security Essentials has not been renamed Windows Defender, or combined with it in Windows 8, 8.1 and 10 (This explanation courtesy of admin).
Having more than one AV installed on your computer is bad, it will slow down the computer, cause internet connection problems and leave you with no AV protection at all if they cancel each other out as they fight for resources.
If any AV product that you have is a paid for version you should always make sure that you have a copy of the product key kept somewhere safe just in case you ever wish to reinstall it.
You can uninstall Avast in the Control Panel but should you have any problems see Avast clean removal info here Please create a new system restore point first.
Once any other AV has been correctly uninstalled, check to see if Windows Defender has auto enabled and allow it to update and carry out a full scan of your computer.
You should also change the update options in Windows so that it checks for updates for any other MS product such as your MS Office.