3.0 Update broke WordPress site

New update broke website. Info below:

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WordPress has a built-in feature that detects when a plugin or theme causes a fatal error on your site, and notifies you with this automated email.

In this case, WordPress caught an error with one of your plugins, License Manager for WooCommerce.

When seeking help with this issue, you may be asked for some of the following information:
WordPress version 6.4.1
Active theme: Exford (version 1.5.26)
Current plugin: License Manager for WooCommerce (version 3.0)
PHP version 7.4.33

Error Details
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An error of type E_ERROR was caused in line 37 of the file /srv/htdocs/wp-content/plugins/license-manager-for-woocommerce/includes/Main.php. Error message: Uncaught Error: Class ‘LicenseManagerForWooCommerce\Abstracts\Singleton’ not found in /srv/htdocs/wp-content/plugins/license-manager-for-woocommerce/includes/Main.php:37
Stack trace:
#0 /wordpress/plugins/wpcomsh/3.13.61/vendor/composer/ClassLoader.php(576): include()
#1 /wordpress/plugins/wpcomsh/3.13.61/vendor/composer/ClassLoader.php(427): Composer\Autoload\{closure}(‘/srv/htdocs/wp-…’)
#2 [internal function]: Composer\Autoload\ClassLoader->loadClass(‘LicenseManagerF…’)
#3 /srv/htdocs/wp-content/plugins/license-manager-for-woocommerce/license-manager-for-woocommerce.php(56): spl_autoload_call(‘LicenseManagerF…’)
#4 /srv/htdocs/wp-content/plugins/license-manager-for-woocommerce/license-manager-for-woocommerce.php(60): LicenseManagerForWooCommerce\lmfwc()
#5 /wordpress/core/6.4.1/wp-settings.php(473): include_once(‘/srv/htdocs/wp-…’)
#6 /srv/htdocs/wp-config.php(81): require_once(‘/wordpress/core…’)
#7 /wordpress/core/6.4.1/wp-load.php(55): require_once(‘/srv/htdocs/wp-…’)
#8 /wordpress/core/6.4.1/wp-login.php(12): require(‘/wordpress/core…’)
#9 {main}
? thrown