Same with me after following all the suggested solutions. However I just now managed to get Support Assist to install. This is what worked for me: After deleting as much as possible per the above advice (which didn't work even after ensuring all tasks and services were killed), I then went to the Dell product support page, clicked on Drivers & Downloads and followed the directions until I got a list of stuff for my machine and then (re)installed the applications that looked to be related to updates (except for Dell Help and Support Application which failed to install): [URL] I then reran the Support Assist installer and it succeeded. I have no idea why or if that would work for anyone else. Support Assist worked fine after that and installed some updates.              
Today I launched Dell's Support Assist to do routine maintenance tasks but as I launched the application it showed me a dialog box saying "A new version of SupportAssist is available and is being installed on this PC. Depending on the speed of your PC, this update can take several minutes." After almost 6hrs the message is still the same. My Notebook is an Inspiron 17 5000 Series with windows 10. Any suggestions??? Thanks
Inspiron 17 5000 - Problem: Support Assist is not updating and stuck