Trouble installing Page Builder plugin

Hi. I’m having trouble installing Page Builder on my website.

When I attempt to install I am shown these series of messages.

“Downloading install package from https://downloads.wordpress.org/plugin/siteorigin-panels.2.2.1.zip…

Unpacking the package…

Installing the plugin…

Destination folder already exists. /home4/barneyb1/public_html/wp-content/plugins/siteorigin-panels/

Plugin install failed.”

I’m not sure how to resolve this, any help would be much appreciated.

Thanks.