I don’t have a cache plugin (that I know of). Sorry, I’m kind of a noob with most of this stuff. I wasn’t able to find the plugin through the wordpress plugin search on my website. So, instead, I downloaded the plugin from wordpress.org, then uploaded the .zip from the “Upload Plugin” page on the wordpress hosted on my server. I don’t know if that changes anything, but I noticed I don’t have a google-authenticator directory on my server under the usual plugins folder.