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Editorial Team
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Asked: 2026-06-06T20:11:08+00:00

I want to update a VSTO addin for word I create without let VSTO

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I want to update a VSTO addin for word I create without let VSTO automatic update launch. In fact, my end-users have not enough rights for installing.

I only want to update it, not install because first install will be done with vsto installation from VS publish folder with administrator rights.

To update, I copy 

MyWordAddIn.dll  
MyWordAddin.dll.manifest

from publish folder to appData folder where my addin is installed.

When I launch my word document which is linked with my VSTO file. I have an error

enter image description here

Sorry for french, It said that there’s already another version which is installed.

But when I launch it the second, third… time, I have no error.

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1 Answer

  1. Editorial Team

    It appears that you did not disable ClickOnce from automatically installing updates on application startup. That would explain why your application is detecting that there is a new version in the publish folder and attempting to install the update. Then, the error is occurring because you already manually updated the DLL in the appData folder, so when it see’s that publish folder contains a DLL with the same version number, it gives the error stating that it’s already installed.

    You can disable the autoupdate by going into your startup project’s settings in VS, clicking the publish tab, and then press the update button and set it to never check for updates.

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