We released a new version of OneStepCheckout for Magento 1, v4.5.8, that supports the security patch SUPEE-9767. Update your checkout now to keep your online store and customer safe. Read more »
We would like to inform all old and new customers that our product OneStepCheckout is not affected by any of the latest security patches provided by Magento. You can apply the patches without having to consider OneStepCheckout being affected by them.