The ppd file needs to be exactly as it appears in my post - no extra garbage. And both that file and the tarball need to be in the current working directory.
I can copy'n'paste the ppd file or "download" it just fine - and I've absolutely no idea what's causing your difficulty in that regard.
But the original problem should now be fixed (as I reported yesterday), so you *should* now be able to successfully run:
ppm install http://www.sisyphusion.tk/ppm/Tk.ppd --force