Many working computers can’t connect to the Internet. Why do you think so? Is it because if you don’t connect to the Internet, you can’t improve the software with a lot of user data? Why can’t you do offline applications like DAZ studio?
MetaHuman Creator is based on a database of high-resolution head scans. This is very large (and will grow), so we can’t practically distribute this as a ‘local’ application. The database is also potentially sensitive, hence not wanting to release the raw data.