Hi,
This plugin includes Google Custom Search Engine search field, and Google CSE do the job include autocomplete.
If you set Autocomplete in your Google CSE admin page, and autocomplete works there (on the right side of Google CSE admin page), then the autocomplete will work on your WP site also.
However I experienced that autocomplete does not (or not always?) work in Google CSE site.
There are some post about this question, I suppose you look at these, e.g. https://support.google.com/customsearch/answer/2631081?hl=en
(In case of our own site it does not help.)
If you find a solution at Google for this autocomplete problem, we would appreciate if you let us know it.
Peter
