Just struggled a little on a new install on Windows as well. The module I copied in couldn't be found. The problem turned out to be quite simple, but I figured it's worth mentioning in case someone else runs into it.
I copied the module into C:\Program Files (x86)\Odoo 11.0\server\addons. At first sight I thought this directory was specified in addons_path in odoo.conf, but on closer inspection that turned out not to be the case. The directory that is there by default is server\odoo\addons. By adding server\addons the module could be found.
addons_path = C:\Program Files (x86)\Odoo 11.0\server\odoo\addons,C:\Program Files (x86)\Odoo 11.0\server\addons
A thought for the OP: if the module is found but the install does not complete then probably an error occurred during installation. You can check odoo.log (in the server folder) for error messages and post them here or contact the author of the module with that information.