so i JUST had this same issue...I was eager to try it out, so i downloaded 16.7 and it installed to hdd (unlike the 17.1)1. download http://mirror.ragenetwork.de/opnsense/releases/16.7/OPNsense-16.7-OpenSSL-cdrom-amd64.iso.bz2 (you can use any mirror, but i used this one)2. install it3. Do your initial config4. run step 12 (update from console)5. enjoy 17.1