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Download FreeBSD 11.1 VMDK and create a VM with it as HDD.
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Get FreeBSD source tree for your exact FreeBSD version and uncompress it to /usr/src:
fetch -o /tmp ftp://ftp.freebsd.org/pub/`uname -s`/releases/`uname -m`/`uname -r | cut -d'-' -f1,2`/src.txz tar -C / -xvf /tmp/src.txz
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Download latest Realtek network driver (you need to input an email address).