By default Delivery on x86 platforms 32-bit LispWorks now creates runtimes which will run on any Pentium-compatible CPU.
In the original LispWorks 6.0 release, SSE2 instructions cause exceptions when LispWorks or a runtime runs on an old CPU lacking these relatively new instructions. The restriction still applies to LispWorks Professional and LispWorks Enterprise editions, but the behavior of their runtimes is now controlled by the delivery keyword argument
The restriction does not not apply to LispWorks Personal Edition, which is configured to run on any Pentium-compatible CPU.
LispWorks Release Notes and Installation Guide - 23 Dec 2011