By using the /passive switch for the secondary architecture, you allow both providers to exist in the Windows Global Assembly Cache (GAC) simultaneously.
AccessDatabaseEngine_x64.exe /quiet
Your application is 32-bit but you installed only the 64-bit driver (or vice versa). Fix: Uninstall your current version and reinstall the matching architecture, or use the "Both" method above to install the missing architecture. download microsoft.ace.oledb.12.0 provider for both 64-bit
Version "12.0" is the 2010 release. While newer versions (like 16.0 for Office 2016) exist, many legacy enterprise systems and SSIS packages are hard-coded to look specifically for Provider=Microsoft.ACE.OLEDB.12.0 . By using the /passive switch for the secondary
Do not download DLL files from shady "DLL download" websites. You need the official redistributable from Microsoft. download microsoft.ace.oledb.12.0 provider for both 64-bit