For those who have done it, my question is this - the program says to take a day off..  If I wanted to do 2 days in a row, should I just complete the last workout again?

As a general rule, they advise to take a day off to let the muscles recuperate from the stress of being worked, especially if they have not been worked in a long time. While you could continue to do two days in a row, I would recommend changing up the routine for the 2nd day to help promote proper muscle growth, instead of letting your muscles get used to the workout, since they don't develop well if that happens.

You should be finishing week 8 by now? or repeating a week somewhere in it if you keep skipping days. Keep at it or get back to it. 2 days inbetween runs is fine, just as long as you have one rest day, the more days off the slower progress is going to be, but if you feel you need an extra rest day then listen to your body and take it.