You may have a problem on Ownership of your files.
The upload files can’t not be move to the files wp-content/ ..
Downloading update from http://downloads.wordpress.org/plugin/...
Unpacking the update
Deactivating the plugin
Removing the old version of the plugin
Could not remove the old plugin
Plugin upgrade Failed
This is probably a permission problem.
With your device you can run the command:
/home/fixperm.sh user
user is the folder of your user on your WHM.