For installation of MochaImport+ perform the following steps

(1) copy the file MochaImportPlus.jsxbin into the folder
"Support Files/Scripts/Script UI Panels" (on Windows) or
"Scripts/Script UI Panels" (on Mac) of your After Effects
installation. 

(2) Start After Effects and make sure that in the preferences 
    (tab "general") the option "Allow Scripts to write Files 
    and Access Network" is enabled.


(3) Start MochaImport+ (via the menu "window" in After Effects)

(4) If you never used Mocha before, start it once manually before
launching it via MochaImport+. On this first startup, Mocha does
some configurations and asks for your preferences.

Here is a video tutorial showing the installation:
http://vimeo.com/15978374
