Importing options from Ajax Search Lite plugin (since version 4.15)
The plugin (since version 4.15) auto-detects, if you had Ajax Search Lite installed previously, and offer a button to import the options from the Lite version to Pro version.
To import the options, simply click on the Ajax Search Pro menu, then under the Create a new search instance fieldset, click the Import from Ajax Search Lite button (don't forget to name the search form as well)
How to import from Ajax Search Lite
Make sure to check the search options after importing them, as some options might be different in the Lite and Pro versions.