Fiire can only pre-install if you buy a Core with the MD. I bought only the MD's and remotes, so I had the same problem. Of course this was also the same time that the DVD's weren't available either. They should have shipped you one though. It would actually seriously piss me off if they didn't as they told me they would fix the problem that I encountered by shipping the non-standard DVD installs with the MD's. I bought the things in early September, but I wasn't able to even boot one of them until sometime in November... the other wouldn't work at all, but that might have been an unrelated hardware issue...
Also, the Fiire special drivers SUCK. Now that I have to re-install anyhow I plan on just using UI2 without the compositing, so I can use a standard MD image. Honestly I don't really care for the transparency anyhow... I think it makes things harder to read... I'm not even sure if the special/non-standard stuff would work in 0710... (Again since I have to re-install anyhow) I'm going to go with the 0710 AMD64 DVD.
If I sound bitter against Fiire... It's because I AM! I'm sure you're thinking the same thing I was: I bought these things so I don't have to deal with this BS and so it would just work! Of course, I've been using Linux for many years, so I was able to troubleshoot the problems fairly easily, but that doesn't really change my perception of Fiire.