Willy's scripts are in two categories. The ones in the trusted zip must be placed in the PSP8 folder Scripts-Trusted. The ones in the restricted zip are to be placed in the PSP8 folder Scripts_Restricted.
When you run them, you should have the script output palette window open and locked open. (View>Palettes>Script Output opens the window if it is not open). Willy has put the instructions you need to run some of the scripts in the script output.