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I encountered the same issues with version 3.0.4, so I had to downgrade back to version 3.0.3. Here is the error message:

WordPress version 6.4.1

Active theme: xxx-bookstore (version 1.0.0)

Current plugin: License Manager for WooCommerce (version 3.0.4)

PHP version 8.0.27

Error Details

=============

An error of type E_ERROR was caused in line 36 of the file

/var/www/html/wp-content/plugins/license-manager-for-woocommerce/includes/Integrations/WooCommerce/Email.php.

Error message: Uncaught TypeError: array_key_exists(): Argument #2

($array) must be of type array, bool given in

/var/www/html/wp-content/plugins/license-manager-for-woocommerce/includes/Integrations/WooCommerce/Email.php:36

Stack trace:

#0 /var/www/html/wp-content/plugins/license-manager-for-woocommerce/includes/Integrations/WooCommerce/Email.php(36):

array_key_exists('wc-completed', false)

#1 /var/www/html/wp-includes/class-wp-hook.php(324):

LicenseManagerForWooCommerce\Integrations\WooCommerce\Email->afterOrderTable(Object(Automattic\WooCommerce\Admin\Overrides\Order),

true, false, Object(WC_Email_New_Order))

#2 /var/www/html/wp-includes/class-wp-hook.php(348):

WP_Hook->apply_filters('', Array)

#3 /var/www/html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)

#4 /var/www/html/wp-content/plugins/woocommerce/templates/emails/email-order-details.php(90):

do_action('woocommerce_ema...',

Object(Automattic\WooCommerce\Admin\Overrides\Order), true, false,

Object(WC_Email_New_Order))

#5 /var/www/html/wp-content/plugins/woocommerce/includes/wc-core-functions.php(345):

include('/var/www/html/w...')

#6 /var/www/html/wp-content/plugins/woocommerce/includes/class-wc-emails.php(421):

wc_get_template('emails/email-or...', Array)

#7 /var/www/html/wp-includes/class-wp-hook.php(324):

WC_Emails->order_details(Object(Automattic\WooCommerce\Admin\Overrides\Order),

true, false, Object(WC_Email_New_Order))

#8 /var/www/html/wp-includes/class-wp-hook.php(348):

WP_Hook->apply_filters(NULL, Array)

#9 /var/www/html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)

#10 /var/www/html/wp-content/themes/xxx-bookstore/woocommerce/emails/admin-new-order.php(35):

do_action('woocommerce_ema...',

Object(Automattic\WooCommerce\Admin\Overrides\Order), true, false,

Object(WC_Email_New_Order))

#11 /var/www/html/wp-content/plugins/woocommerce/includes/wc-core-functions.php(345):

include('/var/www/html/w...')

#12 /var/www/html/wp-content/plugins/woocommerce/includes/wc-core-functions.php(364):

wc_get_template('emails/admin-ne...', Array, '', '')

#13 /var/www/html/wp-content/plugins/woocommerce/includes/emails/class-wc-email-new-order.php(134):

wc_get_template_html('emails/admin-ne...', Array)

#14 /var/www/html/wp-content/plugins/woocommerce/includes/emails/class-wc-email.php(588):

WC_Email_New_Order->get_content_html()

#15 /var/www/html/wp-content/plugins/woocommerce/includes/emails/class-wc-email-new-order.php(111):

WC_Email->get_content()

#16 /var/www/html/wp-content/plugins/woocommerce/includes/admin/meta-boxes/class-wc-meta-box-order-actions.php(156):

WC_Email_New_Order->trigger(126028,

Object(Automattic\WooCommerce\Admin\Overrides\Order), true)

#17 /var/www/html/wp-includes/class-wp-hook.php(324):

WC_Meta_Box_Order_Actions::save(126028, Object(WP_Post))

#18 /var/www/html/wp-includes/class-wp-hook.php(348):

WP_Hook->apply_filters(NULL, Array)

#19 /var/www/html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)

#20 /var/www/html/wp-content/plugins/woocommerce/includes/admin/class-wc-admin-meta-boxes.php(263):

do_action('woocommerce_pro...', 126028, Object(WP_Post))

#21 /var/www/html/wp-includes/class-wp-hook.php(326):

WC_Admin_Meta_Boxes->save_meta_boxes(126028, Object(WP_Post))

#22 /var/www/html/wp-includes/class-wp-hook.php(348):

WP_Hook->apply_filters('', Array)

#23 /var/www/html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)

#24 /var/www/html/wp-includes/post.php(4760): do_action('save_post',

126028, Object(WP_Post), true)

#25 /var/www/html/wp-includes/post.php(4862): wp_insert_post(Array, false, true)

#26 /var/www/html/wp-admin/includes/post.php(453): wp_update_post(Array)

#27 /var/www/html/wp-admin/post.php(227): edit_post()

#28 {main}

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