tunabobmaster

This is my first time using the nexus mod manger and i need help after i closed out of it this popped up after trying to reopen it. It says : You are missing C:\ Program Files (x86)\steam\steamapps\downloading\72580\dataskyrim.esm.Please verify your game install and ensure C:\ Program Files (x86)\steam\steamapps\downloading\72580\dataskyrim.esm is present. I need help someone help me plz!