We do not have a downloadable demo available for our interaction search tool which is basically an automated tool that will test for interaction effects using a logit model. However, let me describe what the software will do once you load in the .CHO file. First, it will run an aggregated logit model for main effects only. Next, it will run a different model with each possible interaction effect added in. Next, it will run a 2 log-likelihood test on each model to see if your interactions add any significant explanatory power. Finally, it will generate a summary report with the interaction effects sorted by significance.