Can't deactivate the plugin

Hi,
I’ve been evaluating the Lite version of the plugin, and inadvertantly hit the wrong button and upgraded the software to the pro version. It’s now indicating on the plugin page that I need to enter an authorization code. I need to get back to the lite version, but can’t deactivate or remove the pro version.

I get this error every time.
Fatal error: Maximum execution time of 30 seconds exceeded in C:\Program Files (x86)\EasyPHP-DevServer-13.1VC9LIVE\data\localweb\honestinks\wp-content\plugins\woocommerce-products-predictive-search-pro\admin\wc-predictive-search-init.php(21) : eval()’d code on line 6

https://www.ads-software.com/plugins/woocommerce-predictive-search/