Hi mbmiller:

What is your Dell computer model, Windows version and OS build number [open a run dialog box (Windows key + R) and enter winver] and current BIOS version [open a Run dialog box, enter msinfo32 to open your System Information panel, and look for the “BIOS Version/Date” field]?

You might find some helpful information in Dave Lorde's 12-Jul-2026 Dell Optimizer 6.3.3.0 says Dell XPS 8950 is not compatible.  In that case a message from Dell suggested Dave should install Dell Optimizer v6.3.x even though this application is not compatible with their XPS 8950 model.

Instructions for performing a clean reinstall of SupportAssist can be found in the support article Dell SupportAssist for PCs and Tablets Installation Issue and its companion video Dell SupportAssist Clean Reinstall that might get SupportAssist running on your computer again.

_____________________________________

NOTE:  I removed ALL SupportAssist-related software [including Dell SupportAssist, Dell SupportAssist OS Recovery (also called Dell SupportAssist Remediation or System Repair), and Dell SupportAssist OS Recovery Plugin] from my Inspiron 5584 after my service warranty expired because they were too buggy and consumed too much RAM and CPU (see my 08-Feb-2025 post in ygil’s BSOD Issues After Windows Updates for further details), but if I needed to perform a clean reinstall of one of these programs I would normally uninstall using Revo Uninstaller Free in Aggressive Model.  I found that Revo Uninstaller was able to find and remove orphaned registry entries and hard drive files that are often left behind by a "regular" uninstall from Control Panel | Programs | Programs and Features or Settings | Apps | Installed Apps.
-----------
Dell Inspiron 15 5584 * 64-bit Win 10 Pro v22H2 build 19045.7725 * Firefox v157.0.1 * Microsoft Defender v4.18.26080.4-1.1.26080.3 * Malwarebytes Premium v5.7.2.358-166.0.5763 * Macrium Reflect Free v8.0.7783 * My Dell v2.2.6.0 * Revo Uninstaller Free Portable v2.7.2 

XPS 16 (Dell 16 Premium) DA16250

<To protect you, your private information was removed from public view. All private data was saved to your private Case. DELL-Admin>

Windows 11 Home 10.0.26200 Build 26200

BIOS Version/Date    Dell Inc. 1.16.0, 8/3/2026

Thanks Imacri, I will check out the info you provided and I have attached the failure file.

Here is what happens in attachments

Hi mbmiller:

If you go to your XPS 16 DA16250 support page at https://www.dell.com/support/product-details/en-us/product/dell-da16250-laptop/drivers, choose "Select Drivers", click the "This Device" tab and enter your unique Service Tag is Dell Optimizer v6.3.5 still in the filtered list of Dell software and hardware drivers that are compatible with your system components?

If Dell Optimizer v6.3.5 is compatible with your XPS 16 DA16250 Service Tag then download a fresh copy of the Dell Optimizer v6.3.5 installer (Dell-Optimizer-Application_GJ7NN_WIN64_6.3.5.0_A00.EXE, rel. 21-Sep-2026) from your support page at https://www.dell.com/support/product-details/en-us/product/dell-da16250-laptop/drivers and save it to your desktop, right-click the .exe file, and choose "Run as Administrator".  Does the installation still fail, and if so what specific error message(s) do you see during the installation?

I'm not qualified to interpret installation logs for Dell software but I took at quick look at the log you posted, and the installation for your Dell Optimizer v6.3.5 appears to be failing with a DEP_HARD_ERROR (Exit Code 4), which sometimes indicates an out-of-date BIOS or missing prerequisite.  You have the latest available Dell 16 Premium DA16250 System BIOS v1.16.0 0 (rel. 10-Sep-2026) so I'm wondering if the Dell Optimizer v6.3.5 installer is having problems installing a required .NET Desktop Runtime.  If you go to Control Panel | Programs | Programs and Features and search for "runtime" what versions are listed?  From my own Inspiron 5584 / Win 10 computer:

NOTE: After installing a .NET Desktop Runtime the word ".NET" will not appear in the product name.

Both .NET v8.0.x and v9.0.x will reach end of support next month on 10-Nov-2026 and the latest SupportAssist v5.2.x now requires .NET Desktop Runtime v10.0.x (see my 27-Aug-2026 post in RomoSouthAm's New SupportAssist 5.2 Version - Asking and Failing to Update OS Recovery Plug-in about recent design changes to SupportAssist v5.2.0 and higher.  It's possible the latest Dell Optimizer v6.3.5 also requires .NET Desktop Runtime v10.0.x as a prerequisite, but the v6.3.5 user guide at https://www.dell.com/support/product-details/en-us/product/dell-optimizer/resources/manuals doesn't mention the .NET requirements.
_________________________________________

Unfortunately, Dell employees rarely respond to requests for assistance in this user forum.  If you are a home consumer (i.e., if your computer is not managed by an IT department in a business environment) and your service warranty hasn't expired you can contact Dell customer support by clicking the blue "Get Help Now" button located in the bottom-right corner of each page of this forum.  This will start a Live Chat session, and after you type in a brief summary of your problem the automated Dell-Cares chat bot will ask for your email address and the unique Service Tag of your computer.  Once it confirms you still have a valid service warranty it should connect you to a live customer service rep.

_________________________________________

HINT: When I want to capture an image of something on my computer screen I typically use the Snipping Tool or the Print Screen key on my keyboard (PrtSc = full screen; Alt+PrtSc =  active Window that has focus), paste it into Microsoft Paint for editing (e.g., re-sizing, highlighting, etc.) and then save the image as a .png file.  See How to take screenshots on Windows 11 and 7 Powerful Screenshot Features Hidden in Windows 11.
-----------
Dell Inspiron 15 5584 * 64-bit Win 10 Pro v22H2 build 19045.7725 * Firefox v157.0.1 * Microsoft Defender v4.18.26080.4-1.1.26080.3 * Malwarebytes Premium v5.7.2.358-166.0.5763 * Macrium Reflect Free v8.0.7783 * My Dell v2.2.6.0 

It fails every time as well as when I try to install support assistant. It started when the support assistant said to update. Every time it tried to update it would start and then just ditappear.so I uninstalled both Optimizer and Support assistant and cannot now reinstall them ...

Hi mbmiller:

I should also mention that many Dell apps share components like Dell Client Management Service, Dell TechHub service and Dell Core Services (i.e., in addition to required .NET Desktop Runtimes).

At this point my best guess is that one or more shared components required by your Dell Optimizer v6.x was either corrupted during a recent SupportAssist program update or completely removed from your system when you uninstalled SupportAssist, which in turn corrupted your Dell Optimizer v6.x installation and prevented it from launching correctly.  Hopefully a clean reinstall of SupportAssist v5.2.1 and/or Dell Optimizer v6.3.5 will restore any damaged or missing shared components so you can launch Dell Optimizer v6.3.5 again.

-----------
Dell Inspiron 15 5584 * 64-bit Win 10 Pro v22H2 build 19045.7725 * Firefox v157.0.1 * Microsoft Defender v4.18.26080.4-1.1.26080.3 * Malwarebytes Premium v5.7.2.358-166.0.5763 * Macrium Reflect Free v8.0.7783 * My Dell v2.2.6.0

Everything is compatible and it still fails in the same way when run as administrator. I have attached a picture of my .NET ststus.

My support ran out last week so I guess I'm out of luck. Thanks for all your help. I see this has happed to other users and there is never and answer so I guess Dell dosent really care.

Regards,

Mike

My support ran out last week so I guess I'm out of luck. Thanks for all your help. I see this has happed to other users and there is never and answer so I guess Dell dosent really care.

Hi mbmiller:

No problem.  If you find that a clean reinstall of SupportAssist v5.x (see my 08-Oct-2026 post <above>) doesn't get this software working you can always post back later if you change your mind and decide you want to keep troubleshooting.

I have attached a picture of my .NET ststus.

I'm not sure why you have so many different .NET Runtimes editions or why you need Visual Studio 2010 Tools for Office Runtime installed on what I assume is a relatively new Win 11 computer, but keep the following in mind if you continue to have problems running software on your system:

• .NET Runtimes are NOT backwards compatible. For example, if you have a third-party program that requires .NET v8.0.x then that is the version that must be installed; your third-party software will not run correctly if you install a higher version like .NET 10.0.x.
• .NET Runtimes are available in different editions like .NET Runtime (for console apps), .NET Desktop Runtime (for desktop applications; includes the “base” .NET Runtime) and ASP .NET (typically for web/server applications).  The required edition depends on the system requirements of the third-party software you have installed. 
• Support ended on 10-May-2022 for .NET 5.0 and on 12-Nov-2024 for .NET 6.0 (expand the section titled "Out of support versions" at https://dotnet.microsoft.com/en-us/download/dotnet).  Any outdated third-party software that still requires these insecure .NET Runtimes should be upgraded or uninstalled to improve your system security. NOTE: As I mentioned in my 09-Oct-2026 post <above>, both .NET 8.0 and .NET 9.0 will reach end of support next month on 10-Nov-2026.
• .NET Desktop Runtimes already include the "base" .NET Runtime. For example, the download page for .NET 9.0 at https://dotnet.microsoft.com/en-us/download/dotnet/9.0, which is currently offering .NET v9.0.20 (rel. 08-Sep-2026), notes that the .NET Desktop Runtime 9.0.20 "includes the .NET Runtime; you don't need to install it separately".  That means .NET Runtime 9.0.x doesn't need to be installed on your system since you already have .NET Desktop Runtime v9.0.x.
• I am not sure why ASP. NET Core Runtime v10.0.x is installed on your system, since ASP.NET Core Runtimes are only used to run web/server applications (websites, web APIs, etc.) and are not required to run typical Windows desktop programs used on most home computers.
• Windows Update does not appear to be keeping all your supported .NET Desktop Runtimes up-to-date.  For example, https://dotnet.microsoft.com/en-us/download/dotnet shows .NET 9.0.20 is the latest release for .NET 9.0.x and .NET 10.0.12 is the latest release for .NET 10.0.x, but you currently have .NET Desktop Runtime v9.0.7 and .NET Desktop Runtime v10.0.11.

-----------
Dell Inspiron 15 5584 * 64-bit Win 10 Pro v22H2 build 19045.7725 * Firefox v157.0.1 * Microsoft Defender v4.18.26080.4-1.1.26080.3 * Malwarebytes Premium v5.7.2.358-166.0.5763 * Macrium Reflect Free v8.0.7783 * My Dell v2.2.6.0 * Microsoft Office Home and Business 2019 C2R Version 2508 / Build 19127.20800