Stability Matrix will not install ComfyUI

[tadzachary]

Hello,

I am dying here. I have been using Stability Matrix for months. Something changed and long story short even a brand new portable mode of Stability Matrix will NOT install ComfyUI, I get the following error message:

Download Complete
Error: StabilityMatrix.Core.Exceptions.ProcessException: pip install failed with code 2: 'Using Python 3.12.10 environment at: venv\nResolved 1 package in 122ms\nDownloading pip (1.7MiB)\n Downloaded pip\nPrepared 1 package in 471ms\nerror: Failed to install: pip-26.0.1-py3-none-any.whl (pip==26.0.1)\n Caused by: The system cannot open the device or file specified. (os error -2147024786)\n'
at StabilityMatrix.Core.Python.UvVenvRunner.PipInstall(ProcessArgs args, Action1 outputDataReceived) at StabilityMatrix.Core.Models.Packages.BaseGitPackage.SetupVenvPure(String installedPackagePath, String venvName, Boolean forceRecreate, Action1 onConsoleOutput, Nullable1 pythonVersion) at StabilityMatrix.Core.Models.Packages.ComfyUI.InstallPackage(String installLocation, InstalledPackage installedPackage, InstallPackageOptions options, IProgress1 progress, Action1 onConsoleOutput, CancellationToken cancellationToken) at StabilityMatrix.Core.Models.PackageModification.InstallPackageStep.ExecuteAsync(IProgress1 progress, CancellationToken cancellationToken)
at StabilityMatrix.Core.Models.PackageModification.PackageModificationRunner.ExecuteSteps(IEnumerable`1 steps)

I have tons of disk space, I disabled anti-virus, I checked everything I can think of and yet it still fails.

Any help would be greatly appreciated! It's the latest version of Stability Matrix 2.15.6.0 Also Windows 11 Pro version 26200.8037

[Ivan-750TI]

In my situation, I have a similar problem. The installation of Stability matrix goes smoothly, but the installation of ComfyUI stops at the "Unpacking resources
Unpacking resources
Download complete!
Python 3.10.11 download complete
" step and continues indefinitely. I have reinstalled Windows, enabled long paths in the registry, and installed the c++ redistributable, but nothing seems to solve the problem. Please help me. Previously, everything worked fine on Windows 10, but after the reinstallation, everything stopped working.

[kuririn-77]

I also had an issue where ComfyUI would stop with an error after installation started, but if you're using ESET, try disabling HIPS, restarting your PC, and then installing ComfyUI—it installed and launched successfully for me.
If you're using ESET, give it a try. Sorry if this doesn't apply to you.