Parallax slider plugin issue

Hello

i have an issue with the parallax slider. When I tried to install it I have this message

Installing and Activating Plugin Parallax slider (1/1)
Downloading install package from http://skywarriorthemes.com/plugins/layerslider.zip…
Unpacking the package…
Installing the plugin…
Plugin install failed.
Plugin activation failed.

I think that’s why i have a bad slider