Looking at the event viewer and in reliability monitor, the installer would give error return code 1603. According to Microsoft, this error code means "A fatal error occurred during installation", i.e the installation of supportassist.

Looking at the installer logs at C:\ProgramData\Dell\SupportAssist\Agent\logs\installer\installer.txt, it also gives that error and a very vague response - "Some error occurred when upgrading MSI support assist". 

Pointing this out as a possible symptom of the issue. 

Yeah just in the Applications event log.   

Sorry for the delay replying - the site only just sent me a notification because someone else mentioned me

This solved my issue. thanks

See my earlier post about having the right version of DotNet installed.  Maybe that will work for you too (there seems to be 2 different issues with the same result).

Hi all,

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Unfortunately this is not the case for several with this problem. I have the correct DotNet installed and still get the error on both my systems. So will wait for a fix from dell. They are supposed to work on a solution.

You're right about that one, that there seem to be two issues with SA that give off the same result. One has to do with NET runtime, while the other has to do with another error that I and many of the people who've encountered this issue don't know about. On the bright side, Dell is working on fixing this. 

I tried installing the latest version of .Net Framework directly from Microsoft. During installation, I got a message that Version 4.8 or later was already installed on my PC. Therefore, .Net installation did not continue.

I was unable to update or install SupportAssist since June 26, 2022. Dell Support contacted me via private message and suggested the following solution, which worked for me:

• Uninstall any previous builds of SupportAssist using the MS Install Uninstall Tool and restart the system. (I had already uninstalled SupportAssist, so this step was moot for me.)
• .NET Runtime 5.0.17 is a pre-requisite for SA v3.11.x to install successfully. It needs to be installed before installing SA. Link to the installer: Download .NET 5.0 Runtime (v5.0.17) - Windows x64 Installer (https://dell.to/3bxKbiv)

After I did that, I was able to successfully install SupportAssist manually using SupportAssistInstaller.exe, which I had previously downloaded.