I Simple Image Gallery Installed but it is not showing up in Plugin list. I tried to install it again and got an error message saying that it's already installed. How do I get the Simple Image Gallery to show up in my Plugin Magager list so I can enable it?

Just in case someone gets to this thread by search, be sure to check the filters for 'enabled' / 'disabled' as well as any name search filter.  Just reset the all and it should show up.  :)