I'm a complete newbie when it comes to these sorts of things and I don't know anything about code. I tried to search for guides on google but it all seemed to complicated for me. Can someone guide me step by step on how to do it?

Basically I want to install this plugin
http://avisynth.nl/index.php/SeeSaw

And the page tells me that I also need to install MaskTools2. Can someone show me how I install these two things? Thank you.