Fix Astra Missing File Error

My site has gone down with a 500 error and WordPress debug points to one culprit: Astra is trying to load class-astra-wp-async-request.php from …/inc/lib/batch-processing/, but that file no longer exists... (Budget: $10 - $30 USD, Jobs: Debugging, HTML, MySQL, PHP, Website Development, Website Management, Website Optimization, WordPress)