Can you have someone look at the SP1 installer - in particular the installer for the Admin console? On a 64-bit machine it's installing LFAdmin.dll in the Program Files (x86)/Laserfiche/Client/Admin directory and resetting all Admin console shortcuts to point there. The only file in that directory is LFadmin.dll, so needless to say, the shortcuts are all broken and so is the admin console after the update. You'll see a "Error loading LFSO92.dll" message if you go to the Program Files/Laserfiche/Client/Admin directory and launch the msc from there.
The Client update to SP1 is working properly - so far it looks like it's just the admin portion that's not detecting it's installing on a 64-bit machine.
Geoff