there may be other reasons for people to have experience problems than not reading instructions? don’t assume that it works for you that it does for others.
I had the same problem described above (plugin not showing in the plugin panel). In my case, I had downloaded the plugins directly to linux and unzipped using linux unzip, and move to wp-content/plugins directory. file permissions were correct (same as akismet) but just did not work.
I deleted the directories and copied them (cp -R) instead of move (mv), this time it worked fine (same permissions/owner).
Why? no idea.
