I had to rebuild my hyper-v server, so I did a clean installation of OPNsense using the latest download, which is OPNsense-19.1.4-OpenSSL-dvd-amd64.iso. I created a generation 2 VM with secure boot disabled, two processors and 2048 of memory. On both NICs, VMQ, IPsec task offloading (512) and SR-IOV are enabled and all of the "advanced features" are disabled. Both NICS are connected to virtual switches.
I had to use CTRL-C a couple of times during the installation because the installer hung.
Aside from that, the installation was successful.