For installation of Tracker2Maskperform the following steps

(1) Go to the After Effects Preferences (Edit->Preferences->General in
the After Effects Menu) and make sure that "Allow Scripts to write
Files and Access Network" is enabled.

(2) copy the file Tracker2Mask.jsxbin into the folder
"Support Files/Scripts/Script UI Panels" of your After Effects
installation. 

(3)Restart After Effects and you will find KeyTweak in the window menu.

For more details see:
http://aescripts.com/knowledgebase/index/view/faq/how-to-install-and-run-scripts/



