I had to reformat my computer this past week.

I backed up my Calibre library, so I lost no books there. Through the years as I got books from Amazon I would download them and put them into Calibre courtesy of Alf. Since I reformatted I have bought a few books from Amazon that were free.
Now, here is my dilemma. When I install and run K4PC it is going to want to automatically download all of the hundreds of free books I have purchased over the years, right? I really really don't want to re-download and try to drudge through all of those books just to find the 5 or so I have gotten since reformatting so I can pull them into Calibre. Is there a way to tell K4PC to only download the books I have purchased in the past week?
I hate reformatting.
S