OWC just put out a nice blog on Mojave:
https://blog.macsales.com/45928-how-to-download-macos-mojave-and-avoid-common-problems?Source=RYW18_Sep21&utm_source=bm23&utm_medium=email&utm_term=Image+-+mojave-app&utm_content=RYW18+-+Sept21&utm_campaign=09/21/2018&_bta_tid=38298447941401967289013406086333572549172102660978503499535571680364091553717964601389716936343194737424676&_bta_c=cwkyq190ooa09v1ay2sxsbe70cbal