Currently the code has the following

// At the moment, windows MSI installer are not handled !
//} else if (platform == NodeJSInstaller.Platform.WINDOWS){

A possible solution to automate installation is to use msiexec with following options:

msiexec TARGETDIR=<install location> /a node-<version>-x86.msi /qn /l* log.txt

this removes any UAC issues and just unpacks the files to TARGETDIR. also adds logging out to log.txt