I think you are missing setting the module contentslider for default store view. In the default storeview we disable the module. You should go to configuration page of ves contentslider and choose default store view in “Current Configuration Scope:” and disable the module.
About the megamenu module don’t show up in menu in admin. Please try to confirm the module was enabled in the system > Configuration > Advanced > Advanced
Yes you can send me the website information to my email: [email protected]. Our supporter will check and give you correct solution.
Answer for Megamenu doesnt show