Thank you for your help. But what was happening was when I would find the plugin to install it would say unavailable, after I hoover over the question mark it says:
“This plugin is not allowed on our system due to performance, security, or compatibility concerns. Please contact support with any questions.”
Turns out, the problem is not the plugin itself, but that my site is managed by GoDaddy and W3 Total Cache is blacklisted by GoDaddy (ugh!). I really would like to use this plugin so now I’m looking into new hosting.
Thanks again for your responses. I have resolved the issue now.