1. Steps for Testing extend Features of OSGeo4W :

• Before you follow this steps you should do all configurations and build the setup.exe at http://trac.osgeo.org/osgeo4w/wiki/SetupDevelopment
• make the following:

    Download "setup.override.ini"  file  from [http://trac.osgeo.org/osgeo4w/browser] in the root of your local directory 'C:\' 
    ./setup.exe  # run it.
    Choose the next option: Advance Install > Install from internet > Root Directory > Local package directory > Direct connection 
    Choose a restrictive package for example "gdal-mrsid" or " gdal-ecw " or both,  you should to choose these because I just created a files for each 
     one in download.osgeo.org server. If you choose another restrictive package setup.exe will raise an error,  and choose another normal package for
     example: "gdal-java".
    
  

• Setup will download the license file from remote server into your local directory "Local Package Directory" , you can see it if you want.
• Next step setup.exe will load the file license into a window and it will show you.