I have Wordpress 4.2.5 running, with PHP 5.4. I am installing CiviCRM 4.6.8. I followed the directions here: http://wiki.civicrm.org/confluence/display/CRMDOC/WordPress+Installation+Guide+for+CiviCRM+4.5#
Before installing I checked with my hosting provider that I had all the other specs listed on the page to install and their support person confirmed that I did, fwiw.
I downloaded the CiviCRM folder, then uploaded it via sftp into the wordpress plugins folder, after changing the permissions for that folder. I tried both writeable and executable permissions.
When I log in to my wordpress site with my administrator credentials CiviCRM does not appear in the plugins directory anywhere, or in the plugins editor dashboard.
I saw that Jetpack and Super Cache were incompatible with CiviCRM. I deactivated both, but no change.