Au3Info is the predecessor to EU3_Spy. This program which you can use to find the class or indexes of windows which you want to program for. For this newer version of Au3Info the interface is much simpler and items are easier to find. For example if you want to find the index of a window, like paltalk text area drag the Finder Tool to the area you want to get the index for and you will see the index on the box next to where it says Instance.
Note: There are two files in the zip one is a 64Bit and the other is 32Bit use the one according to your system Bit 🙂