I did a clean install of the phpBB2 software to upgrade my two forums http://www.mulle-kybernetik.com/forum/Optimization/phpBB2 and http://www.mulle-kybernetik.com/RAL/messageboard/. I ran into problems, because the style Charcoal2 is outdated and doesn't support Visual Confirmation.
Here's how I fixed it. (Your webserver must be willing to traverse symlink)
cd templates/Charcoal2 mv admin admin.old ln -s ../subSilver/admin mv profile_add_body.tpl profile_add_body.tpl.old ln -s ../subSilver/profile_add_body.tplThe solution is pretty easy, but took me more than an hour to reach. I suspect most of the templates in Charcoal2 are just straight copies of older versions of subSilver. At a certain point of time in my life (retirement) I am gonna check out an older version of phpBB2, diff subSilver against Charcoal2 and symlink all the identical template files.