Looking at the install log, it said
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Installing using command 'C:\Users\user865e6\AppData\Local\Temp\VSDAC69.tmp\VSTOR40\vstor40_x64.exe' and parameters ' /q:a /c:"install /q /l"'
Unable to run create process. GetLastError returned: 1223
Status of package 'Microsoft Visual Studio 2010 Tools for Office Runtime (x86 and x64)' after install is 'InstallFailed'
I was able to work around this issue by running the following in a cmd prompt:
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vstor40_x64.exe /q:a /c:"install /q /l"
This rebooted Windows; I was then able to do the AddIn install successfully.