installing zip files

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ok, I want to put the "addthisbar" plugin

I have got it showing under "new" on the add functionality section. I have uploaded the zip and unpacked files to the root and 777 them but I still get this message

" The following errors occurred when attempting to process your request:

* There was an error unpacking your file. Perhaps you have not uploaded a valid zip file, or you do not have zip installed."

paulvwells
 
Mnkras replied on at Permalink Reply
Mnkras
did you unzip to it /packages/
?