How do I install the ScanSnap software on my new iMac / Mountain Lion?

Question

I have been everywhere trying to figure this out.  Fujitu's site tells me to simply update the software already installed.  Problem is that it's not already installed.  I don't have a disk drive and so I cannot install with the disk.  I downloaded v3.2 (which seems to be the software itself) from the Fujitsu site but when I double click to install I get a small box indicating 'The following disk images cannot be opened' and underneath it leasts the ScanSnap.dmg with a reason of 'not recognized'.   I know this is a popular scanner (I have the S1300) and so I am hoping someone has faced this and figured it out.  Fujitsu's site is rather confusing on the topic.

Answer 1

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether your problem is caused by third-party system modifications that load automatically at startup or login. 
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode* and log in to the account with the problem. The instructions provided by Apple are as follows:
Shut down your computer, wait 30 seconds, and then hold down the shift key while pressing the power button.
When you see the gray Apple logo, release the shift key.
If you are prompted to log in, type your password, and then hold down the shift key again as you click  Log in.
*Note: If FileVault is enabled under OS X 10.7 or later, or if a firmware password is set, or if the boot volume is a software RAID, you can’t boot in safe mode. Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.  The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.