Could not load file or assembly 'AlphaFS.Internal, Version=2.1.0.0
Problem reported by Malaska Drahoslav - 9/26/2025 at 12:14 AM
Resolved

Hello,
I have an issue with FileUltimate v8.0.0.
When deploying it to the production server, I get the error:
Could not load file or assembly 'AlphaFS.Internal, Version=2.1.0.0'.


I tried searching for the required file to download, but I cannot find it anywhere.
This dependency also appears in higher versions:

// Assembly GleamTech.FileUltimate, Version 9.6.0.0

In another thread, I read that this dependency was removed and only the AlphaFS.dll library remained.
How can this problem be resolved, or where can I download the file AlphaFS.Internal, Version=2.1.0.0?

Thanke you.
Malaska Drahoslav Replied
I tried installing the NuGet package AlphaFS, but only AlphaFS.dll was downloaded.
I also searched on GleamTech.FileUltimate 8.0.0 but I couldn’t find anything there either.
Cem Alacayir Replied
Employee Post Marked As Resolution
You don't need to download anything. The error is probably caused by a conflict in your bin folder on production server:

Ensure there is no old DLL file named GleamTech.Core.dll anywhere in your project, it was replaced with new DLL file named GleamTech.Common.dll since FileUltimate v7.3.0 and DocumentUltimate v5.1.5 (November 20, 2019 updates).

In Visual Studio: Go to Tools -> NuGet Package Manager -> Package Manager Console and run these commands one by one in order: 

Uninstall-Package FileUltimate -RemoveDependencies

Uninstall-Package FileUltimate.NuGetOrg -RemoveDependencies

Install-Package GleamTech.FileUltimate

If you are using direct DLL references instead of NuGet reference, first clean your project, remove references to old assembly GleamTech.Core.dll, add references to new assembly and rebuild your project. Ensure there is no GleamTech.Core.dll left in your project bin folders.

Also note that GleamTech DLLs come as a set, so you should use the GleamTech.Common.dll which corresponds to GleamTech.FileUltimate version. You can’t mix them from other versions.

For example GleamTech.FileUltimate 9.7.2 comes with this set:


By the way you say 
I have an issue with FileUltimate v8.0.0 
but after that you show
// Assembly GleamTech.FileUltimate, Version 9.6.0.0
Malaska Drahoslav Replied
My goodness, I just overwrote it with the new version :). Thank you very much for the quick solution and response. One more question: if I update FileUltimate:LicenseKey value "QUH7R89QVN-64P3U8USU9-C...." from version 5.9.0 to version 8.0.0, will the older 5.9.0 components continue to work, or will they fail due to license key validation? The production environment is still running on the older version, but I want to switch to version 8.0.0.

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