My fonts wont load in my new mac mini running 10.14. I get a message that the developer can't be trusted or something line that. I have never had font problems until this. and have been a mac guy since the nineties.

Font book will not load my fonts. I get a "can't trust developer" type message when I try to load them. Also, when I look at the file on the solid state drive, they don't say suitcase, etc. but look like executable files. I am about to buy a font manager as have spent several hours on this issue and can not find any solution online.