I am having the same issues, just installed the update for the awsom-news plugin and it’s not showing in the Manage Plugins page
EDIT:
Just discovered the issue I was having. Much to my chagrin, if I had read the instructions, I wouldn’t have had an issue ??
Basically what I was doing was uploading the folder which contained a second folder that held the plugins… so I just uploaded the interior folder. Perhaps this will solve your problem as well?