ASSURA and IC are separate tools, they must be installed separately. You do NOT install them to the same location. For example (THIS IS NOT HOW IT WILL BE ON YOUR SYSTEM):
/opt/EDA/cadence/IC/614 <--- THIS IS $CDS or whatever you choose to call it
/opt/EDA/cadence/ASSURA/41 <--- THIS IS $ASSURAHOME
I like to install my tools according to .../TOOLNAME/VERSION, maybe your admin doesn't do this. If you have assura installed but did not set $ASSURAHOME that's why you can't find those binaries.