Hi John,
The latest version that I am aware of is here:
https://www.microsoft.com/en-us/download/confirmation.aspx?id=50040. You'll definitely want the 64 bit version of it with 64 bit Toad.
I tried to install the 64 bit version of it on my PC to test it before posting this, but I have 32 bit MS Office installed, and they won't install together.
Edit: after a quick search, I also found this
Note: This works with Toad 13.3 64 bit and 14.0 64 bit, but only install this if you don't have the full MS Access already installed. If you do, it will downgrade your Access installation to the runtime.
-John