0.0.12 and 0.0.11 should be fine, but he says he isn't able to activate the plugin. Are you seeing any messages in the server console when you click activate?
Uploads. No subdirectories for uploaded images
When an image is uploaded by a user, it is placed in one folder /public/uploads/files.
However, a folder can often contain a limited number of files and directories, say 64,000. And searching for a file is slower when there are many files in a directory.
Usually, uploaded files are placed into subdirectories:
Though, I checked now.
I can create 1 million files in a directory on my Ubuntu box with the ext4 file system.
So, it should work with the current configuration.