Unfortunately, it appears that the developer has decided to remove various important features from the latest version of Quick Cache (such as the ability to exclusion certain url patterns which is essential for compatibility with plugins such as Woocommerce). The features were removed and added to a new commercial version of the plugin.
There is nothing wrong with wanting to sell a premium plugin. However, by removing features from the free version, the latest version of Quick Cache now breaks certain websites.
This is a dangerous practice.