Skip Support Assist. Go directly to Dell Downloads and let it scan for updates. Support Assist sometimes tries to install updates that are already installed or not needed for your model. You should have posted your model name and number when asking a question. 
I'm in a circle of download-install (when I click to update it), it fails halfway through every time. [IMAGE] [IMAGE]   I tried again from the main page, and now it says "No updates to install"... so I'm confused as to what actually happened.
Dell Security Advisory Update - DSA-2021-088 Failed... no reason shown