You still had to download that software they mention on the site though, right?
Lavender_and_Roses, how much do you know about park traffic patterns and Fastpass? You are visiting in the off-season (although some people may be visiting to see the waters in the Rivers of America). But aside from Sunday and then Friday afternoon and evening, I'm not sure that Ridemax will be of much use to you at all. Even if the parks are very quiet it can in theory help you slightly with lines, but if the parks aren't crowded I'd rather spend more time enjoying the atmosphere, even if it means going on slightly fewer rides. I found when I used Ridemax plans that they created a real mentality of having to hurry from place to place, and when rides are down it makes it a lot harder to roll with the punches.
The only issue I really foresee for with crowds for your visit is that if there are any WoC soft openings scheduled, there may be a lot more people visiting the parks. In theory, those people will primarily be in DCA and possibly waiting in a line or holding area somewhere.

And even if they aren't, I'm not sure that Ridemax will be of much help, as they use historical data and would be predicting a (for example) 35 minute wait for Toy Story Midway Mania at 1 PM, but if an extra 20,000 people visit the parks that day, it could easily be an hour, and Ridemax wouldn't be able to compensate for that.
If you DO get Ridemax, I'd try running a summer-type weekday plan, starting about 10 or 11 AM, for one day, just to get some ideas of what your worst-case scenario is. (Keeping in mind that your conditions will almost certainly be better.)
Have a great trip!