Please, please, please follow the instructions fully when installing. They are at the top of the Skill file and also here:
Download and install the precompiled potrace release suitable for your platform: http://potrace.sourceforge.net/download set the POTRACE_PATH environment variable to the path to the executable eg. C:\utils\potrace Download and install the precompiled ImageMagick release suitable for your platform This may not be necessary if you use Linux as ImageMagick is often included in Linux installations: http://www.imagemagick.org/script/binary-releases.php eg. http://www.imagemagick.org/download/binaries/ImageMagick-6.5.3-Q16-windows.zip If the path to the ImageMagick convert.exe file is not in your system path then set the MAGICK_HOME environment variable to the path to the convert executable. (Run "convert -version" in a system shell to test). eg. C:\utils\ImageMagick\ImageMagick-6.5.1-3 Install logoMaker_public.il into your skill folder. Add load("logoMaker_public.il") to the allegro.ilinit file in your pcbenv folder.
Try removing the High pass filtering. See the attached image for my settings and the resultant logo.