Hi,
I think it is better to ask IntroPro about this customization.
By chekcking this video, the version of Lisa is 7.1(this version needs JVM 7.X).
The current supported versions DevTest are 9.1 or upper(include 10.X) and these versions need the JVM 8.X.
Then if you get this customization only jar file(s), but there are some possibilities that this customized step cannot work as expected with current supported versions of DevTest.
In this version(7.1), Lisa did not include any Selenium related features.
But from Lisa 7.5, Lisa(DevTest) includes the Selenium integration test cases.
Then if you are using the current supported versions, then you can use the Selenium Integation test case or you can create your own custom step.
Cheers,