Hi, it’s aim is to hide wordpress. but having said that it might not be just plug and play. It’s a complex task to hide wordpress from a wordpress site, and depending upon the theme and plugins been activated in site, some settings needs to be enabled/disabled. In your case also, as mentioned above, there are some occurrences of wp-admin path name and hence wp-admin path name needs to be renamed. Also there was comment added by cache plugin.
Regarding the cart issue, it could have been conflict with other plugin there, and disabling/tweaking some settings in HMWP would have resolved that too. We can do it for you, let us know. Thanks!