Help with a portable application

I have a large application running on nodejs, the application has about 4 GB of content and I need to distribute the application to 2000 schools approx but the schools do not have access to internet. Other problem is that the application runs on two different OS Debian Based and Win7 but it is installed in one disk ( due to its 4 GB content) shared between the two OS. 

The question is how can I build a portable application easy to install on this environment? Ideas?

You can burn into a DVD your application and redistribute to your 2000 schools.

To solve npm dependencies instalation you can install npm from specific folder into the DVD/hard disk with node_modules folder (You need to run npm instsall /myfolder/npm_package) and that requires you modify the package.json file. Test if all the make files are working on.