Trying to drop Mac OS 9 disk image over sheepshaver on Sierra gives me error "Please drop either a file named 'Mac OS ROM'... " I'm trying to install sheepshaver to run old mac games on my Macbook running Mac OS Sierra. I know I should download the Mac OS 9 image and name it "Mac OS ROM” and drop it over sheepshaver wrapper. I named it properly, dropped it on the wrapper, and I still get that message:

Please drop either a file named “Mac OS ROM” or a Mac OS installation disk image on me.

Do not drop any other kind of file.


What am I doing wrong here?
I had a similar issue and realised that I was running the application from my Downloads folder, this violates the "app translocation" introduced in macOS sierra. You need to copy the application to another directory, e.g. the Applications directory and then copy the ROM file over.