Edit the config/vmx.conf file to define your interfaces, CPU affinity, and bridge settings.
wget -c --header="Cookie: juniper-session=YOUR_COOKIE" \ "https://downloads.juniper.net/software/vmx/17.1/junos-vmx-17.1R1.8.tgz" download juniper vmxbundle 171r18tgz verified
Juniper provides GPG signatures for verification: Edit the config/vmx