While installing open even viewer > windows logs > Application 

Let the installation fail and you will have exact reason in error logs for installation failure. 

Meanwhile you can also try  this guide I have posted on this forum several times. 

Follow this Guide from start to end do not miss any steps 

You may find that a few thing I am recommending to delete are already deleted from your computer so skip those steps.  

1 Use Microsoft's Installer : 

This step is crucial as Microsoft's uninstaller disables the services as well. Choose SupportAssist and uninstall, Uninstall Dell updates by running the the uninstaller again. If Support Assist doesn't show in List ignore this step. 

Reboot (important) 

2. Delete following folders and ignore the once which are already deleted. 

C:/ Program Data/ PCDR 

C:/ Program Data/Supportassist 

C:/ Program Data/Dell/Dell data volt 

C:/ Program Files/ Dell/Supportassist 

C:/ Program Files/ Dell/ Dell data Volt 

C:/ windows/Temp (everything inside the folder 

Remove these Registries 

Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services key.

Delete Dell hardware service, Delete Dell client management service, Delete Dell updates. 

Open device manager > system devices : If you see 2 Dell dala volt devices, please uninstall the second one. 

Reboot 

install SupportAssist 

Thanks for the tip about the event logs

It seems that Dell needs to update their modules because Microsoft.NETCore.App 5.0.0 x64 is not installed. 

Thus why the errors.

But Dell is out of date because THAT specific version is out of date !

Hopefully Dell will take that into account soon...

Until then I'll have to wait because I'm not planning on installing a no longer supported element.

I guess Dell didn't anticipate this.....

Hi,

I have been trying to install SA forever since it stopped working, I have tried so many things. I found this in C:\ProgramData\Dell\SupportAssist\Agent\logs\installer , maybe you could help me 

2022-06-23 17:23:22,486 [3.11.4.29] [16500 - 1] INFO Dell.SupportAssist.Client.SupportAssistInstaller.ViewModel.AppViewModel - Manufacturer Value : Alienware
2022-06-23 17:23:22,493 [3.11.4.29] [16500 - 1] INFO Dell.SupportAssist.Client.SupportAssistInstaller.ViewModel.AppViewModel - Process Arguments : esupport
2022-06-23 17:23:22,493 [3.11.4.29] [16500 - 1] INFO Dell.SupportAssist.Client.SupportAssistInstaller.ViewModel.AppViewModel - Installer Started with Arguments: esupport. UI visible: True
2022-06-23 17:23:22,493 [3.11.4.29] [16500 - 1] INFO Dell.SupportAssist.Client.SupportAssistInstaller.ViewModel.AppViewModel - Current Culture being Set: en-US
2022-06-23 17:23:23,009 [3.11.4.29] [16500 - 1] INFO Dell.SupportAssist.Client.SupportAssistInstaller.MainWindow - Mutex Created New : True
2022-06-23 17:23:23,404 [3.11.4.29] [16500 - 1] ERROR Dell.SupportAssist.Client.Utilities.RegistryUtility - SOFTWARE\Dell\SupportAssistBusinessClient : Not exists
2022-06-23 17:23:23,405 [3.11.4.29] [16500 - 1] ERROR Dell.SupportAssist.Client.Utilities.RegistryUtility - HKEY_LOCAL_MACHINE\SOFTWARE\Dell\SupportAssist ProManage : Not exists
2022-06-23 17:23:23,405 [3.11.4.29] [16500 - 1] INFO Dell.SupportAssist.Client.SupportAssistInstaller.MainWindow - All prerequisite product check passed
2022-06-23 17:23:23,431 [3.11.4.29] [16500 - 7] INFO Dell.SupportAssist.Client.SupportAssistInstaller.AutoUpgradeHelper.CheckForAutoUpdate - Downloading catalog from FTP
2022-06-23 17:23:23,438 [3.11.4.29] [16500 - 7] INFO Dell.SupportAssist.Client.Utilities.DirectoryUtility - C:\Users\Marian\AppData\Local\Temp\SupportAssistAgent\AutoUpdate has any file links or is it a Junction: False
2022-06-23 17:23:23,715 [3.11.4.29] [16500 - 15] INFO Dell.SupportAssist.Client.DownloadManager.DownloadManager - Download Completed with error status : NIL.
2022-06-23 17:23:23,727 [3.11.4.29] [16500 - 15] INFO Dell.SupportAssist.Client.DownloadManager.DownloadManager - Disposing Web Client Object.
2022-06-23 17:23:23,746 [3.11.4.29] [16500 - 7] INFO Dell.SupportAssist.Client.AutoUpdateUtilities.AutoUpdateWrapper - C:\Users\Marian\AppData\Local\Temp\SupportAssistAgent\AutoUpdate\SUPPORTASSISTAGENTCATALOG.CAB Is Extraction Successfull : True
2022-06-23 17:23:23,749 [3.11.4.29] [16500 - 7] INFO Dell.SupportAssist.Client.SupportAssistInstaller.AutoUpgradeHelper.SupportAssistInstallerPackage - Checking for any Dot Net Core or ASP Dot Net Upgrade
2022-06-23 17:23:23,766 [3.11.4.29] [16500 - 7] INFO Dell.SupportAssist.Client.SupportAssistInstaller.AutoUpgradeHelper.SupportAssistInstallerPackage - Installed Dot-Net Utilities are up-to-date, Checking for SA Installation
2022-06-23 17:23:23,770 [3.11.4.29] [16500 - 7] ERROR Dell.SupportAssist.Client.Utilities.RegistryUtility - SOFTWARE\Dell\SupportAssistAgent : Not exists
2022-06-23 17:23:23,770 [3.11.4.29] [16500 - 7] INFO Dell.SupportAssist.Client.SupportAssistInstaller.Installer - Installed Version: 0.0.0.0
2022-06-23 17:23:23,772 [3.11.4.29] [16500 - 7] ERROR Dell.SupportAssist.Client.Utilities.RegistryUtility - SOFTWARE\Dell\SupportAssistAgent : Not exists
2022-06-23 17:23:23,772 [3.11.4.29] [16500 - 7] INFO Dell.SupportAssist.Client.SupportAssistInstaller.AutoUpgradeHelper.CheckForAutoUpdate - Checking for availability of any Higher Version
2022-06-23 17:23:23,899 [3.11.4.29] [16500 - 7] INFO Dell.SupportAssist.Client.AutoUpdateUtilities.AutoUpdate - Inclusion and Exclusion conditions satisfied
2022-06-23 17:23:23,899 [3.11.4.29] [16500 - 7] INFO Dell.SupportAssist.Client.AutoUpdateUtilities.AutoUpdate - Product that will be installed is serviceability/Catalog/SupportAssistx64-3.11.4.29.msi
2022-06-23 17:23:23,899 [3.11.4.29] [16500 - 7] INFO Dell.SupportAssist.Client.AutoUpdateUtilities.AutoUpdate - Product Installation/Upgrade Available : True
2022-06-23 17:23:23,901 [3.11.4.29] [16500 - 7] INFO Dell.SupportAssist.Client.SupportAssistInstaller.AutoUpgradeHelper.SupportAssistInstallerPackage - Starting to download SupportAssist from FTP Server
2022-06-23 17:23:25,726 [3.11.4.29] [16500 - 9] INFO Dell.SupportAssist.Client.DownloadManager.DownloadManager - Download Completed with error status : NIL.
2022-06-23 17:23:25,939 [3.11.4.29] [16500 - 9] INFO Dell.SupportAssist.Client.SupportAssistInstaller.AutoUpgradeHelper.SupportAssistInstallerPackage - SupportAssist successfully downloaded from FTP Server at C:\Users\Marian\AppData\Local\Temp\SupportAssistAgent\AutoUpdate\SupportAssistx64-3.11.4.29.msi
2022-06-23 17:23:25,939 [3.11.4.29] [16500 - 9] INFO Dell.SupportAssist.Client.DownloadManager.DownloadManager - Disposing Web Client Object.
2022-06-23 17:23:26,268 [3.11.4.29] [16500 - 7] INFO Dell.SupportAssist.Client.SupportAssistInstaller.AutoUpgradeHelper.SupportAssistInstallerPackage - Hash Values for SupportAssist Agent downloaded execuatble and the one fetched from catalog file matches
2022-06-23 17:23:26,270 [3.11.4.29] [16500 - 7] INFO Dell.SupportAssist.Client.SupportAssistInstaller.AutoUpgradeHelper.SupportAssistInstallerPackage - Installation triggered
2022-06-23 17:23:26,273 [3.11.4.29] [16500 - 7] INFO Dell.SupportAssist.Client.SupportAssistInstaller.Utility.InstallerUtility - ProcessName : msiexec.exe is getting executed
2022-06-23 17:24:12,571 [3.11.4.29] [16500 - 7] INFO Dell.SupportAssist.Client.SupportAssistInstaller.Utility.InstallerUtility - process return Code : 1603
2022-06-23 17:24:12,572 [3.11.4.29] [16500 - 7] ERROR Dell.SupportAssist.Client.SupportAssistInstaller.AutoUpgradeHelper.SupportAssistInstallerPackage - Some Error occured while upgrading msi SupportAssist Agent :
2022-06-23 17:24:12,572 [3.11.4.29] [16500 - 7] INFO Dell.SupportAssist.Client.SupportAssistInstaller.AutoUpgradeHelper.CheckForAutoUpdate - Auto Update Exiting with result : False
2022-06-23 17:24:12,576 [3.11.4.29] [16500 - 7] ERROR Dell.SupportAssist.Client.SupportAssistInstaller.InstallSupportAssist - SupportAssist download/installation failed with return code: msiinstallationfailed
2022-06-23 17:24:12,584 [3.11.4.29] [16500 - 7] INFO Dell.SupportAssist.Client.AutoUpdateUtilities.AutoUpdate - Deleting Downloaded files
2022-06-23 17:24:12,588 [3.11.4.29] [16500 - 1] INFO Dell.SupportAssist.Client.SupportAssistInstaller.MainWindow - Releasing all the held Resource
2022-06-23 17:24:18,222 [3.11.4.29] [16500 - 1] INFO Dell.SupportAssist.Client.SupportAssistInstaller.MainWindow - Application Exit Code: msiinstallationfailed
2022-06-23 17:24:18,223 [3.11.4.29] [16500 - 1] ERROR Dell.SupportAssist.Client.Utilities.RegistryUtility - SOFTWARE\Dell\SupportAssistAgent : Not exists
2022-06-23 17:24:18,224 [3.11.4.29] [16500 - 1] INFO Dell.SupportAssist.Client.SupportAssistInstaller.MainWindow - Calling Application EXIT

look in the journal of events on our pc
Check in 

• Windows llogs/journals
  • Application

If you have this type of error, then don't look any further, you have the same problem as me.

They are using a no longer supported version of the NETRuntime component and DELL needs to update it asap, because it ain't good to have a software using depreciated components, but who knows when they will

Actually, I followed your steps and I think deleting temp and data vault did the trick, after almost half year of trying I could finally install SA! Thank you so much!

Same problem here on both my systems. The installation starts but comes up with the error that the installation was unable to complete the installation. Restart the PC dosent help. So the update is failing. I guess that we have to wait for Dell to send out a automatic fix so the installation will complete successful? Seen several post on the same problem today. Will not force install a outdated NET 5.0 and possibly be causing other bigger problems. Luckily SA still works after failed attempt (need to restart the pc first before launching SA again).

Strange, I have .Net 5.0 installed on two of my machines and only one fails to update SA. The other one  updated successfully. 

Had the same problem. I just reinstalled Supportassist for Dell site and it updated correctly.

---

@XPS_Man wrote:
.....

1. Delete following folders and ignore the once which are already deleted. ...

---

Hi XPS_Man:

The Dell Tech Support video at Dell SupportAssist Not Installing was recently updated on 17-Jun-2022 and includes some additional folders, registry entries and Windows services that are not listed in your clean reinstall instructions <above> (e.g., C:\Program Files\Dell\SupportAssistAgent, etc.).  Your instructions might need to be revised if the new SupportAssist v3.11.x installers are creating files and registry entries in new locations.
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64-bit Win 10 Pro v21H2 build 19044.1766 * Firefox v101.0.1 * Microsoft Defender v4.18.2205.7-1.1.19300.2 * Malwarebytes Premium v4.5.10.200-1.0.1702 * Macrium Reflect Free v8.0.6758 * Dell SupportAssist v3.10.4.18 * Dell Update for Windows Universal v4.5.0 * Inspiron 5583/5584 BIOS v1.18.0
Dell Inspiron 15 5584, Intel i5-8265U CPU, 8 GB RAM, 256 GB Toshiba KBG40ZNS256G NVMe SSD, Intel UHD Graphics 620