i was looking for a plugin like komper for a while, and was quite happy fiding yours.
Before buying the pro version i wantet to test the free verdion and it seems i have some problems here.
After installing the free version (download from your website) i´ve set up a field list and added 2 products. This worked fine, and sample output looks good.
As well i updated the permalink structure and added the komper widget.
The problems are now:
1. I can see the Komper searchform but no "Display Button"
2. If i type something in the searchform no results show up