Conflitto/errore critico del componente aggiuntivo WP File Download

L'ultima versione di WP File Dowload Addon presenta un conflitto con Simply Schedule Appointments, che causa un errore critico quando entrambi sono attivi contemporaneamente. Sembra esserci una nuova cartella /lib/prod_vendor che contiene una versione precedente di guzzlehttp (6.5.8). Credo che questo sia in conflitto con la versione inclusa in Simply Schedule Appointments, ovvero la 7.7.0. Stack trace qui sotto.

Errore fatale: Errore non rilevato: Chiamata al metodo non definito GuzzleHttp\Utils::chooseHandler() in /var/app/current/wp-content/plugins/simply-schedule-appointments/vendor/guzzlehttp/guzzle/src/functions.php:61 Stack trace: #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\\Service\\...') #8 /var/app/current/wp-content/plugins/wp-file-download-cloud-addon/app/admin/classes/WpfdAddonGoogle.php(271): Google\Service\Drive\Resource\Files->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, Array) #13 /var/app/current/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #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} generato in /var/app/current/wp-content/plugins/simply-schedule-appointments/vendor/guzzlehttp/guzzle/src/functions.php alla riga 61