Design Time Adaptor

Design Time Adaptor for Excel
Needed for document-level
Needed for Ribbon designer

Visual Studio 2019

Visual Studio Tools for Office Design-Time Adaptor for Excel

C:\Program Files (x86)\Microsoft Visual Studio\Shared\ 
Visual Studio Tools for Office\x64\VSTOExcelAdaptor.dll 

Visual Studio 2017

Visual Studio Tools for Office Design-Time Adaptor for Excel

C:\Program Files (x86)\Microsoft Visual Studio\Shared\ 
Visual Studio Tools for Office\x64\VSTOExcelAdaptor.dll 

Visual Studio 2015

Visual Studio Tools for Office Design-Time Adaptor for Excel

C:\Program Files\Microsoft Visual Studio 14.0\ 
Visual Studio Tools for Office\x64\VSTOExcelAdaptor.dll 

Visual Studio 2013

Visual Studio Tools for Office Design-Time Adaptor for Excel

C:\Program Files\Microsoft Visual Studio 12.0\ 
Visual Studio Tools for Office\x64\VSTOExcelAdaptor.dll 

Visual Studio 2012

Visual Studio Tools for Office Design-Time Adaptor for Excel

C:\Program Files\Microsoft Visual Studio 11.0\ 
Visual Studio Tools for Office\x86\VSTOExcelAdaptor.dll 

Visual Studio 2010

Visual Studio Tools for Office Design-Time Adaptor for Excel

C:\Program Files\Microsoft Visual Studio 10.0\ 
Visual Studio Tools for Office\x86\VSTOExcelAdaptor.dll