Update your SqueakMap - it's trying to fetch an old installer 
(InstallFFI.st) which got injured when I tried to replace the installer 
on SM in situ (I was trying to overwrite the old with the new version 
but SM doesn't update the checksum for it, so the install *always* 
fails). The updated version should fetch InstallFFI3.st instead.

Cheers,
   - Andreas

Craig Latta wrote:
> Hi--
> 
>      When I load VMMaker 3.8b6 in Squeak 3.9 via SqueakMap, I'm informed
> that it depends on the FFI package. When I load the FFI package, it
> halts after writing the following to the Transcript:
> 
> ***
> 
> Download from original url
> (http://map.squeak.org/accountbyid/cf58c358-46ee-465e-b6db-2740e9b32a53/files/InstallFFI.st)
> failed with this exception: Incorrect SHA checksum of file from orginal URL
> Trying server cache instead.
> Download from server cache of FFI 1-3.9 failed with this exception:
> Incorrect SHA checksum of file from server
> 
> ***
> 
>      What now? (In the meantime, I'll try earlier Squeak releases until
> something works, then give up.)
> 
> 
>      thanks!
> 
> -C
>