Cannot instal the plugin

edited July 2018 in Revolution Slider
I cannot instal the following plugins: Layer Slider, Slider Revolution and WPBakery Page Builder

I receive the following error:Downloading installation package from http://api.muffingroup.com/plugins/download.php?plugin=LayerSlider

Unpacking the package…Installing the plugin…

The package could not be installed. The plugin contains no files.

Plugin installation failed.

What is the problem, what can i do?

Thanks,
A.M


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