# Excel Add-in Installation

**URL:** <https://community.dlubal.com/t/excel-add-in-installation/4051>\
**Category:** Product Support\
**Tags:** installation, rfem-6, excel\
**Created:** [August 7, 2026, 10:26pm UTC](https://community.dlubal.com/t/excel-add-in-installation/4051 "2026-08-07T22:26:29Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Petrjii](https://community.dlubal.com/letter_avatar_proxy/v4/letter/p/dec6dc/32.png) [@Petrjii](https://community.dlubal.com/u/Petrjii)\
**Post date:** [August 7, 2026, 10:26pm UTC](https://community.dlubal.com/t/excel-add-in-installation/4051/1 "2026-08-07T22:26:30Z")

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Hello,  
I wanted to try out the Excel add-in, but I wasn't able to install it. I'm using the latest version of RFEM 6.15.0005, on Windows 11 with MS Office 2024. The installation file, which is located in the tools/ExcelAddIn folder, displays the following error:

> Name:  
> From: file:///C:/Program Files/Dlubal/RFEM 6.15/tools/ExcelAddIn/ExcelAddIn.vsto
> 
> \*\*\*\*\*\*\*\*\*\*\*\*\*\* Exception Text \*\*\*\*\*\*\*\*\*\*\*\*\*\*  
> System.Deployment.Application.DeploymentDownloadException: Stažení file:///C:/Program Files/Dlubal/RFEM 6.15/tools/ExcelAddIn/Application Files/ExcelAddIn\_1\_0\_0\_4/ExcelAddIn.dll.manifest nebylo úspěšné. ---\> System.Net.WebException: Soubor C:\Program Files\Dlubal\RFEM 6.15\tools\ExcelAddIn\Application Files\ExcelAddIn\_1\_0\_0\_4\ExcelAddIn.dll.manifest nebyl nalezen. ---\> System.Net.WebException: Soubor C:\Program Files\Dlubal\RFEM 6.15\tools\ExcelAddIn\Application Files\ExcelAddIn\_1\_0\_0\_4\ExcelAddIn.dll.manifest nebyl nalezen. ---\> System.IO.FileNotFoundException: Soubor C:\Program Files\Dlubal\RFEM 6.15\tools\ExcelAddIn\Application Files\ExcelAddIn\_1\_0\_0\_4\ExcelAddIn.dll.manifest nebyl nalezen.  
> v [System.IO](http://System.IO).\_\_Error.WinIOError(Int32 errorCode, String maybeFullPath)  
> v System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY\_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)  
> v System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy)  
> v System.Net.FileWebStream..ctor(FileWebRequest request, String path, FileMode mode, FileAccess access, FileShare sharing, Int32 length, Boolean async)  
> v System.Net.FileWebResponse..ctor(FileWebRequest request, Uri uri, FileAccess access, Boolean asyncHint)  
> --- Konec trasování zásobníku pro vnitřní výjimku ---  
> v System.Net.FileWebResponse..ctor(FileWebRequest request, Uri uri, FileAccess access, Boolean asyncHint)  
> v System.Net.FileWebRequest.GetResponseCallback(Object state)  
> --- Konec trasování zásobníku pro vnitřní výjimku ---  
> v System.Net.FileWebRequest.EndGetResponse(IAsyncResult asyncResult)  
> v System.Deployment.Application.SystemNetDownloader.DownloadSingleFile(DownloadQueueItem next)  
> --- Konec trasování zásobníku pro vnitřní výjimku ---  
> v Microsoft.VisualStudio.Tools.Applications.Deployment.ClickOnceAddInDeploymentManager.GetManifests(TimeSpan timeout)  
> v Microsoft.VisualStudio.Tools.Applications.Deployment.ClickOnceAddInDeploymentManager.InstallAddIn()

Am I missing something?

Thank you for your support

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**Author:** ![paul.sivolgin](https://community.dlubal.com/user_avatar/community.dlubal.com/paul.sivolgin/32/104_2.png) [@paul.sivolgin](https://community.dlubal.com/u/paul.sivolgin)\
**Post date:** [August 10, 2026, 1:57pm UTC](https://community.dlubal.com/t/excel-add-in-installation/4051/4 "2026-08-10T13:57:12Z")

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Hi Petrjii,

Seems like the "ExcelAddIn.dll.manifest" file is missing inside the installation under  
👉 C:\Program Files\Dlubal\RFEM 6.15\tools\ExcelAddIn\Application Files

I shared the fixed ExcelAddIn installation via private message.

Let me know if this solved the problem.

Best regards  
Paul Sivolgin

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**Author:** ![Viktor\_Zakora](https://community.dlubal.com/letter_avatar_proxy/v4/letter/v/57b2e6/32.png) [@Viktor\_Zakora](https://community.dlubal.com/u/Viktor_Zakora)\
**Post date:** [August 12, 2026, 1:48pm UTC](https://community.dlubal.com/t/excel-add-in-installation/4051/5 "2026-08-12T13:48:09Z")

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Hello. Please send it to me as well.