I have made many attempts to install this using the instructions provided and cannot get this plugin to activate. I get no errors, it just will not activate. I used older versions just fine. Looking at the manual instructions I cannot figure out how to install this either.
"Or you can unzip and FTP upload the plugin to your plugins directory (wp-content/plugins/). In either case, when done wp-content/plugins/w3-total-cache/ should exist."
This doesn't help much.