Your /inc file holds your database forum configuration, settings and mybb configs.
If you don't have it, then you are fucked.
MyBB Support
Accidently Deleted INC Folder
Submitted by Glunar, 12-07-2016, 10:48 PM, Thread ID: 22355
Thread Closed
RE: Accidently Deleted INC Folder 13-07-2016, 07:38 AM #5
13-07-2016, 07:38 AM
#5