If your legacy ERP or reporting tool crashes when opening .xlsx or .accdb files, you likely need the 2010 Redistributable (32-bit).
If you are a developer running 64-bit Office but need to support 32-bit apps, you will need to run the installer via the command line using the /passive switch, which forces a side-by-side install (not recommended for production user machines).
AccessDatabaseEngine.exe /quiet
Microsoft Access Database Engine 2010 Redistributable Version: 2010 (build 14.0.4761.1000 – varies slightly with updates) Architecture: 32-bit (x86) Official purpose: Allows non-Office applications to read/write to Access (.mdb, .accdb) and Excel (.xls, .xlsx, etc.) files without needing Microsoft Office or Access installed.