You need to download .Net Framework 4.0 for the PL Bots. Just google it and download it. Also, what Operating System are you running on? And they also require WindowerHelper.dll which you can get at
www.windower.net/forums and download the Windowerhelper.dll and the other .dlls that come with it. There's also a few other things that you may be able to find in the thread where this file came from.