If you are working within Access or Excel, you can enable the reference without a manual download: MS Office - Access - DAO 3.6 Object Library - Microsoft Q&A
This is the safest, most modern method for Windows 10/11. microsoft dao 3.6 object library download
Downloading legacy system DLLs from unofficial websites poses significant risks: If you are working within Access or Excel,
"Reference to Microsoft DAO 3.6 Object Library missing or broken." microsoft dao 3.6 object library download