Do you have NI-VISA installed on your computer as well? It looks like this is a requirement for this driver. You can find VISA in the link below. I also included the 6485 driver download from the NI website.
NI Drivers: http://www.ni.com/downloads/drivers/
I installed the driver for the Keithley 6485. However, the block diagrams do not show up after the install. There is a KE6485 folder in inst.lib, but the LabVIEW files are in LabVIEW library files. Moving them into individual files does not change this situation.
Could you be a little more specific about the BDs "not showing up"? How do you access the block diagrams? Which BDs don't show up?
I see it is an IVI driver, do you have the IVI Foundatain shared components installed?
Quite frankly I have never seen an IVI driver that worked properly.
You would be better off just writing your own set of "instrument drivers" using SCPI commands that are probably available in the manual.
The problem ended up being that the Keithley driver was only 32 bit and I was using the 64 bit LabVIEW.