I've encountered a persistent issue with a program failing to function properly following the recent updates: This issue has been reported by multiple users on Dell’s forums. requesting a Dell prioritize a patch!

2025-10 Cumulative Update for Windows 11 Version 24H2 for x64-based Systems (KB5066835) – Build 26100.6899
2025-10 .NET 8.0.21 Security Update for x64 Client (KB5068331)
2025-10 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11 Version 24H2 for x64 (KB5066131)

Since these updates were applied, the application behaves as if it's running in a legacy or non-compatibility mode similar to older versions that weren’t designed for the current system structure. I’m unsure of the root cause, but I was able to reinstall the app using the Microsoft Fix Tool to resolve installation/uninstallation issues. However, the same problem persists: the application attempts to execute a function, then immediately returns an error flag. I’ve been informed this is a known issue, but I haven’t seen any official fix released yet.

Please advise if there are any updates or workarounds available. I’ve documented additional troubleshooting steps below for reference.

Root Cause Summary:
Exception Type: InvalidFileHandleException

Trigger: Dell’s PathHelper.CheckPathRedirection() fails due to a corrupted or inaccessible file handle in ProgramData\Dell\Dell TechHub.

Likely Culprit: Windows update hardened file access or altered redirection behavior, especially under .NET 8.0.

Strategic Fix Path:
Verify Folder Integrity

Navigate to C:\ProgramData\Dell\Dell TechHub\

Check for missing or corrupted files. If access is denied, take ownership:

powershell
takeown /f "C:\ProgramData\Dell\Dell TechHub" /r /d y
icacls "C:\ProgramData\Dell\Dell TechHub" /grant administrators:F /t
Clear Dell TechHub Cache

Delete contents of Dell TechHub folder (not the folder itself).

Reboot and relaunch SupportAssist.

Repair .NET Runtime

Reinstall or repair .NET 8.0 via Microsoft’s .NET download page.

Run:

powershell
dotnet --list-runtimes
Clean Reinstall of SupportAssist

Use Dell’s SupportAssist Uninstaller or Revo Uninstaller.

Reboot and install the latest version.

Registry Redirection Check (Advanced)

Inspect HKLM\SYSTEM\CurrentControlSet\Control\FileSystem for redirection flags.

Look for LongPathsEnabled or NtfsDisable8dot3NameCreation—these can affect file access logic.

Dell Community Escalation

This issue has been reported by multiple users on Dell’s forums. requesting a Dell prioritize a patch!

System:

Inspiron 5570

Details about your Support services

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

SupportAssist Version: 4.10.1.42635

Memory: 16GB

Processor: Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz

Operating System: Microsoft Windows 11 Home

OS Name Microsoft Windows 11 Home
Version 10.0.26100 Build 26100
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name DESKTOP-AF4F3F8
System Manufacturer Dell Inc.
System Model Inspiron 5570
System Type x64-based PC
System SKU 0810

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