Conflicto/error crítico del complemento WP File Download

La última versión del complemento WP File Download Addon presenta un conflicto con Simply Schedule Appointments, lo que provoca un error crítico cuando ambos están activos simultáneamente. Parece haber una nueva carpeta /lib/prod_vendor que contiene una versión anterior de guzzlehttp (6.5.8). Creo que esto entra en conflicto con la versión 7.7.0 incluida en Simply Schedule Appointments. Rastreo de pila a continuación.

Error fatal: Error no detectado: Llamada al método indefinido GuzzleHttp\Utils::chooseHandler() en /var/app/current/wp-content/plugins/simply-schedule-appointments/vendor/guzzlehttp/guzzle/src/functions.php:61 Rastreo de pila: #0 /var/app/current/wp-content/plugins/wp-file-download-cloud-addon/lib/prod_vendor/guzzlehttp/guzzle/src/HandlerStack.php(42): GuzzleHttp\choose_handler() #1 /var/app/current/wp-content/plugins/wp-file-download-cloud-addon/lib/prod_vendor/guzzlehttp/guzzle/src/Client.php(65): GuzzleHttp\HandlerStack::create() #2 /var/app/current/wp-content/plugins/wp-file-download-cloud-addon/lib/prod_vendor/google/apiclient/src/Client.php(1190): GuzzleHttp\Client->__construct(Array) #3 /var/app/current/wp-content/plugins/wp-file-download-cloud-addon/lib/prod_vendor/google/apiclient/src/Client.php(1143): Google\Client->createDefaultHttpClient() #4 /var/app/current/wp-content/plugins/wp-file-download-cloud-addon/lib/prod_vendor/google/apiclient/src/Client.php(411): Google\Client->getHttpClient() #5 /var/app/current/wp-content/plugins/wp-file-download-cloud-addon/lib/prod_vendor/google/apiclient/src/Client.php(891): Google\Client->authorize() #6 /var/app/current/wp-content/plugins/wp-file-download-cloud-addon/lib/prod_vendor/google/apiclient/src/Service/Resource.php(238): Google\Client->execute(Object(GuzzleHttp\Psr7\Request), 'Google\\Service\\...') #7 /var/app/current/wp-content/plugins/wp-file-download-cloud-addon/lib/prod_vendor/google/apiclient-services/src/Drive/Resource/Files.php(174): Google\Service\Resource->call('generateIds', Array, 'Google\\Servicio\\...') #8 /var/app/current/wp-content/plugins/wp-file-download-cloud-addon/app/admin/classes/WpfdAddonGoogle.php(271): Google\Servicio\Drive\Recursos\Archivos->generateIds(Array) #9 /var/app/current/wp-content/plugins/wp-file-download-cloud-addon/app/site/google.init.php(14): WpfdAddonGoogleDrive->checkAuth() #10 /var/app/current/wp-content/plugins/wp-file-download-cloud-addon/app/site/init.php(40): include_once('/var/app/curren...') #11 /var/app/current/wp-includes/class-wp-hook.php(308): wpfdAddonInit('') #12 /var/app/current/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Matriz) #13 /var/app/current/wp-includes/plugin.php(517): WP_Hook->do_action(Matriz) #14 /var/app/current/wp-settings.php(623): do_action('init') #15 /var/app/current/wp-config.php(44): require_once('/var/app/curren...') #16 /var/app/current/wp-load.php(50): require_once('/var/app/curren...') #17 /var/app/current/wp-blog-header.php(13): require_once('/var/app/curren...') #18 /var/app/current/index.php(17): require('/var/app/curren...') #19 {main} agregado en /var/app/current/wp-content/plugins/simply-schedule-appointments/vendor/guzzlehttp/guzzle/src/functions.php en la línea 61