The Excel-based Migration Add-in (Data Migration for Excel) previously worked fine against one server/URL, but after moving to a new server and URL, reinstalling it fails, even after fully uninstalling it through Add/Remove Programs and the Office 2016 add-ins list.

Q: The Excel-based Migration Add-in (Data Migration for Excel) previously worked fine against one server/URL, but after moving to a new server and URL, reinstalling it fails, even after fully uninstalling it through Add/Remove Programs and the Office 2016 add-ins list.

Check the registry key HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\Excel\Addins\Ifs.Application.Fndmig.ExcelAddin — if a stale Manifest value from the old server/URL is still present there, delete that registry value and reinstall the add-in again. If that alone doesn't resolve it, also clear out the ClickOnce deployment cache folder under %LOCALAPPDATA%\Apps\2.0\ before reinstalling, since a stale cached deployment there can likewise block a clean reinstall against the new server/URL.

Answer

Check the registry key HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\Excel\Addins\Ifs.Application.Fndmig.ExcelAddin — if a stale Manifest value from the old server/URL is still present there, delete that registry value and reinstall the add-in again. If that alone doesn't resolve it, also clear out the ClickOnce deployment cache folder under %LOCALAPPDATA%\Apps\2.0\ before reinstalling, since a stale cached deployment there can likewise block a clean reinstall against the new server/URL.

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