To remove an installation of 32-bit LispWorks in the default location, do this - carefully - as root:
rm -rf /opt/LispWorks/lib/LispWorks-32-bit
rm /opt/LispWorks/bin/lispworks-7-0-0-rs6k-aix
If you do not also have 64-bit LispWorks installed here, you can also do
rm -rf /opt/LispWorks
To remove an installation of 64-bit LispWorks in the default location, do this - carefully - as root:
rm -rf /opt/LispWorks/lib/LispWorks-64-bit
rm /opt/LispWorks/bin/lispworks-7-0-0-rs6k64-aix
If you do not also have 32-bit LispWorks installed here, you can also do
rm -rf /opt/LispWorks
LispWorks Release Notes and Installation Guide - 2 Mar 2015