Oops. Secunia PSI still reports the following as needing manual update ("click to update"): Adobe Flash Player 25.x; Microsoft .NET framework 4.x; Microsoft Internet Explorer 11,x (64 bit); Microsoft Internet Explorer 11.x; Microsoft SQL Server 2005 Compact Edition (I never use this); and Microsoft Windows 10.
Selecting "click to update" Windows 10 takes me to a Microsoft document with a link to install the Creators Update (already installed several weeks ago in the natural unforced update cycle). The system reports the installed version as 1703, which AFAIK is the Creators Update and also the most recent available version. Speccy reports the most recently installed Hotfix as KB4025342, the Cumulative Update for version 1703 as of 7/19/2017. Settings/System/About reports installed version as Windows 10 Home, Version 1703, Build 15063.483
Speccy reports .NET frameworks installed as v4.7 Full, v4.7 Client, v3.5 SP 1, v3.0 SP 2, v2.0 SP 2.
Speccy reports Internet Explorer as version 11.483.15063.0
Speccy reports Security Update for Adobe Flash Player KB4025376 as installed on 7/19/2017
Question arising: should I really try to re-install the Creators Update (and then, I suppose, all the subsequent "hotfixes"), or should I wait for Microsoft to sort this out? It looks to me as if the Windows update, downloaded presumably last night and run this morning while restarting after updating Malwarebytes, may have gotten thoroughly messed up? Either that, or Secunia PSI got confused.
Since Malwarebytes is apparently no longer messed up, I propose to continue the discussion here only, and not in the anti-malware forum (where I will post a link). I hope that is correct.