I'm mostly working on Sharepoint 'frontend' - never on the admin part of updates ect, so please bear with me. I have a new client that have SharePoint 2016 (on-prem) installed, running on a SQL 2014 - all on one server. Their SharePoint site has never been updated since the installation. :-( From what I could see, the windows updates have been running and installed until this morning (9 Aug 2018), but no other updates than those that came with Windows. I don't know if SP updates also come through windows, but their SharePoint give funny errors like when opening a sub site settings - it says 'File not found'. I had a look in the Central Admin and saw some updates did not run. See attached image.
So I was thinking of doing an update to the latest version, hopefully this will fix the problems.
I have a few questions and need some guidelines please: 1. Whereto do I go from here regarding updates - do I need to install all updates one by one since the last update, or can I only update the latest one. 2. How do I run the updates, should I download them and if so, is there a step by step guide which I can use?
I would really like to help this client get the SharePoint fixed, but need help.