... I am using a XPS 13 9300, windows 11 home, version 21H2, build 22000.593. Everything was working fine prior to the attempt to update supportassist ... Did your XPS 13 9330 ship with Windows 11 or did you upgrade from Windows 10 to Windows 11 yourself? Has your service warranty expired yet (i.e., if you provide your unique service tag to DELL-Cares in a private message as they requested have they offered to provide assistance)? There is an official Dell support video posted on YouTube called Dell SupportAssist Not Installing (Official Dell Tech Support) - UPDATED that explains how to locate and manually delete folders and registry entries left behind by a Control Panel uninstall of SupportAssist that could be preventing the proper re-installation of SupportAssist. I've never followed those instructions myself so I can't tell you how well they work (as previously mentioned, I normally use Revo Uninstaller Free in Aggressive mode to uninstall my Dell apps), but if your service warranty hasn't expired yet you might want to ask DELL-Cares if the instructions in that video are up-to-date for Windows 11 users. What is the full name and version number of Dell Update application currently installed at Control Panel | Programs | Programs and Features? I checked the Drivers and Downloads tab of the XPS 13 9300 support page at [URL] and chose "Windows 11" as the operating system and was able to find a program called Dell Command | Update Windows Universal Application v4.4.0 (rel. 29-Oct-2021) that is compatible with both Win 10 and Win 11. [IMAGE] If you want to confirm this is the correct Dell Update software for your system configuration enter your unique Service Tag at [URL] This should open the support page for the XPS 13 9300, and if you click on the Drivers and Downloads tab (and confirm that it has correctly auto-detected your Win 11 OS) then it should only list software and drivers that are the best match for your hardware and operating system. Just an aside, but the Dell Update application recommended for my Inspiron 5584 was not compatible with Win 11 until v4.4.0 was released.  If you previously ran Win 10 on your XPS 9300 and still have an older Dell Update v4.3.0 application installed I doubt it will run correctly on your current Win 11 OS.-----------64-bit Win 10 Pro v21H2 build 19044.1586 * Firefox v98.0.2 * Microsoft Defender v4.18.2202.4-1.1.19000.8 * Malwarebytes Premium v44.5.7.186-1.0.1645 * Dell SupportAssist v3.10.4.18 * Dell Update for Windows 10 Universal v4.5.0 * Macrium Reflect Free v8.0.6635 * Revo Uninstaller Free Portable v2.3.8Dell Inspiron 15 5584, Intel i5-8265U CPU, 8 GB RAM, 256 GB Toshiba KBG40ZNS256G NVMe SSD, Intel UHD Graphics 620
Hello,  SupportAssist failed to update itself. Then I tried to uninstall/reinstall it using the Dell employee DELL-Chris M's SA Uninstall / Reinstall for instructions but it is still failing to install ! And in addition, the Dell Update app doesn't work anymore after having followed the process (needs the Dell Client Management Service that cannot be found anywhere)... My XPS13 was up to date prior to the SupportAssist crash running windows 11. Thanks for your help ! T. 
XPS : SupportAssist failed to update then failed to reinstall