Looks as if you're trying to install the driver from an rpm. Is that right? If so, I take it you know the usual warnings about installing alien rpms in pclos. Maybe you should request the driver is packaged for pclos...?
Looking at other distro forums where this issue has arisen, it looks as if Epsom supply the driver as two packages, iscan and iscan-data, which has to be installed first.
But remember this is not recommended and you will lose all support if things don't work out as you hope.