Normal way to find your downlds is go to your LW Library window, select Saved Files folder & press the Explore button. Sample image here: Using Library Explore button to access downld folder (click on link) & the folder will open up for you.

However, it sounds like originally, you had the program folder as the downld folder, so when reinstalling, it deleted your previous downlds. The default location for downlds is C:\Documents and Settings\"your account name"\Shared
That's the safest location for them to downld to.

You could search the word incomplete, as your downlds would be either a level up or down from that location in the directory. If you only find one incomplete folder, then it seems you did indeed initially have the program folder as the downld folder.