Similar error here. Your plugin is crashing site when switching on to PHP 7.x version. It wordks fine only with PHP 5.6
Fatal error: Uncaught Error: Class 'Requests_Exception' not found in /home/platne/serwer23858/public_html/explorer/wp-includes/Requests/Transport/cURL.php:422 Stack trace: #0 /home/platne/serwer23858/public_html/explorer/wp-includes/Requests/Transport/cURL.php(177): Requests_Transport_cURL->process_response() #1 /home/platne/serwer23858/public_html/explorer/wp-includes/class-requests.php(381): Requests_Transport_cURL->request() #2 /home/platne/serwer23858/public_html/explorer/wp-includes/class-http.php(394): Requests::request() #3 /home/platne/serwer23858/public_html/explorer/wp-includes/class-http.php(626): WP_Http->request() #4 /home/platne/serwer23858/public_html/explorer/wp-includes/http.php(162): WP_Http->get() #5 /home/platne/serwer23858/public_html/explorer/wp-content/plugins/dethemekit-for-elementor/includes/admin/include/template-library.php(90): wp_remote_get() #6 /home/platne/serwer23858/public_html/explorer/wp-content/plugins/dethemekit-for-elementor/includes/admin/include/template-library.php(107): DethemeKit in /home/platne/serwer23858/public_html/explorer/wp-includes/Requests/Transport/cURL.php on line 422