# How to install Microsoft.Office.Interop.Excel.dll for Dynamo via Revit2021? Office2007?

**URL:** <https://forum.dynamobim.com/t/how-to-install-microsoft-office-interop-excel-dll-for-dynamo-via-revit2021-office2007/67710>\
**Category:** Revit\
**Tags:** excel, dynamo\
**Created:** [August 31, 2021, 8:30am UTC](https://forum.dynamobim.com/t/how-to-install-microsoft-office-interop-excel-dll-for-dynamo-via-revit2021-office2007/67710 "2021-08-31T08:30:44Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Aminka13](https://avatars.discourse-cdn.com/v4/letter/a/5f9b8f/32.png) [@Aminka13](https://forum.dynamobim.com/u/Aminka13)\
**Post date:** [August 31, 2021, 8:30am UTC](https://forum.dynamobim.com/t/how-to-install-microsoft-office-interop-excel-dll-for-dynamo-via-revit2021-office2007/67710/1 "2021-08-31T08:30:44Z")

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Hello.  
I used Revit2018 before and all was good. But recently i got Revit2021, and it causes problem with API scripts in Dynamo, using Microsoft.Office.Interop.Excel.dll. I have read that topic [«Предупреждение: ошибка операции Data.ImportExcel. Не удалось загрузить файл или сборку Microsoft.Office.Interop.Excel... при запуске сценария Dynamo в Revit | Revit 2021 | Autodesk Knowledge Network](https://knowledge.autodesk.com/ru/support/revit-products/troubleshooting/caas/sfdcarticles/sfdcarticles/RUS/Warning-Data-ImportExcel-operation-failed-Could-not-load-file-or-assembly-Microsoft-Office-Interop-Excel-when-running-the-Dynamo-script-in-Revit.html) but it was useless - i have Office2007 on my PC, and there is even no folders GAC\_MSIL in C:\Windows\assembly\ . How can I solve that problem with Office2007?

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**Author:** ![Marcel\_Rijsmus](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/marcel_rijsmus/32/8539_2.png) [@Marcel\_Rijsmus](https://forum.dynamobim.com/u/Marcel_Rijsmus)\
**Post date:** [August 31, 2021, 10:08am UTC](https://forum.dynamobim.com/t/how-to-install-microsoft-office-interop-excel-dll-for-dynamo-via-revit2021-office2007/67710/2 "2021-08-31T10:08:19Z")

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> [@Import info from Excel? Data.ImportExcel operation Failed](https://forum.dynamobim.com/t/import-info-from-excel-data-importexcel-operation-failed/29395/21):
>
> I had the same issue, import excel failed. I realized that recently IT had a rough time installing MS Project, and probably had to reinstall Office, but likely did 32-bit. I had to uninstall MS 365 Apps AND MS Project separately before I could install 64-bit apps from my MS account from [Office.com](http://Office.com). I didn’t need to restart or press special OK accept terms type thing, I just fired up Civil 3D and Dynamo and the node now works.

Hope it helps

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**Author:** ![Aminka13](https://avatars.discourse-cdn.com/v4/letter/a/5f9b8f/32.png) [@Aminka13](https://forum.dynamobim.com/u/Aminka13)\
**Post date:** [August 31, 2021, 12:07pm UTC](https://forum.dynamobim.com/t/how-to-install-microsoft-office-interop-excel-dll-for-dynamo-via-revit2021-office2007/67710/3 "2021-08-31T12:07:55Z")

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Thanks for help, but i have only Office2007 32bit, and i cannot get x64Office - it is our corporative solution. So it is still a question is it possible to install Microsoft.Office.Interop.Excel.dll for Revit2021 and 2007 Officeх32.