Installing the 64 bit edition of Access Database Engine 2010 when the 32 bit edition is installed
You can indeed install the 64 bit edition of the Access Database Engine 2010 when the 32 bit edition is installed. You need to add a /passive switch and install it from the command line. See the Microsoft Access Database Engine 2010 Redistributable blog posting for more details.
Now who was the original discoverer of this quirk I have no idea. I couldn’t find any mention of this on the MS website but …
Thanks to Sameer Panse in the Should Access Database Engine match OS install or Office install? posting for finding this option.