I am working wit a win10 64 bits 16mb of ram. I want to install Lyon on my computer and not get rid of 2.83. My 2.83 is a stand allone install. I thought I could install Lyon usion OSGEO 4w installer. Nevertheless, even though I tried several times, I can not get acces to the grass plugin. I can not found it on the plugin manager nor I can found a toolbar. I tried to uninstall the OSgeo4w install several times, ask for to isntall Lyon, grass and Saga and no luck at all. I found at http://mappinggis.com/2015/08/novedades-del-plugin-grass-en-qgis-2-10-pisa/ (in spanish) that Lyon handles grass differently than 2.83 and that in order to have access to Grass I must install it using the stand allone version.
How do I a Install Lyon with Grass support using the OSGEO installer and not the standalone?