Reformatted computer; can't figure out where to get my AVISynth plugins :/

I try to make an effort to prepare and backup things in every way prior to reformatting. This was naturally an issue I forgot to prepare for.
I had so many filters that I don't even know where to begin, but I'll try.
Being able to utilize TFM(), TDecimate(), ConverToUV12() would be nice start. Even MPEG2Source won't load, despite my thinking I properly installed it.
When searching I go in circles. Countless pages give usage examples and such, but I can't find the actual download links.
Sorry for the newbie question :confused: