Installation issues… Conflict?

I use your Page Builder by SiteOrigin along with SiteOrigin Widgets Bundle successfully on my main site I designed and managed. This is a site for my car club http://www.ontariozcar.com

Couple of months back I installed the same 2 on another site that is hosted at a different location, and designed the site successfully using SiteOrigin Widgets Bundles with no issues. The site looks fine and works fine. However I went back in today to do some changes and when I try to edit SiteOrigin Editor, the following message pops up:

“You need to install SiteOrigin Widgets Bundle to use the widget SiteOrigin_Widget_Editor_Widget.
Save and reload this page to start using the widget after you’ve installed it.”

When I try to install the SiteOrigin Widgets Bundle, I get this message:

Downloading install package from http://downloads.wordpress.org/plugin/so-widgets-bundle.zip…
Unpacking the package…
Installing the plugin…
Destination folder already exists. D:/Hosting/xxxxxxx/html/xxxxxxxx/xxxx/wp-content/plugins/so-widgets-bundle/
Plugin install failed.

Although it says it is already installed, I cannot see it on my installed plugins page, even for me to deactivate or delete for a clean install.

Wonder if anyone has a clue why this is happening… is it due to a conflict with another plugin? It did work before and only started with the issue lately.

Any help would be greatly appreciated!

URL: http://zccazconvention.com/conventions/2016/