I think these were included in AMVapp. But try this page (http://avisynth.org/warpenterprises/) - I don't know, if it's still maintained, but it has a nice filter collection going. If it doesn't work, I can zip you the plugins and upload them. Another good filter collection is stored here (http://avisynth.org/mediawiki/External_filters) on the avisynth wiki (http://avisynth.org/mediawiki/Main_Page) and is therefore updated regulary.
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And I'm so happy you did find the tut useful.