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While PIAs are architecture-agnostic (they are IL-only), the registry that resolves them is bitness-sensitive. Ensure your setup includes the (or later) redistributable for x64.
Microsoft Visual Studio 2010 Tools for Office Runtime -x64- is a runtime environment that allows .NET Framework-based solutions to interact with Microsoft Office applications, such as Microsoft Word, Excel, Outlook, and PowerPoint. This software provides a set of libraries, tools, and APIs that enable developers to create custom Office solutions, including add-ins, document-level customizations, and application-level extensions. microsoft visual studio 2010 tools for office runtime -x64-
On x64 systems, VSTO 2010 Runtime enforces CAS (Code Access Security) via .NET 4.0’s security policy. For an add-in to run: While PIAs are architecture-agnostic (they are IL-only), the
64-bit Windows Operating System with Microsoft Office x86 Version must be deployed. such as Microsoft Word
Always test with: