I am currently struggling with this issue also.
I actually found a copy of the ScanSnap Manager Evernote Edition after some digging online, however the installation crashes as soon as I run it. Here is what I get:
It seems like the installer is pointed to a copy of Evernote that no longer exists.
Additionally, I'll mention that I already have Evernote installed!
I'd really like to get this resolved if anyone can help revive this year-old post.
Thx
D