I bought the Mentor theme and am trying to install the required plugins. The following error message is given:

Downloading installation package from http://oceanthemes.net/plugins-required/js_composer.zip…

Download failed. Forbidden

I am missing:

WPBakery Visual Composer

Booked Calendar

OT One Click Import Demo Content

OT Testimonial

Revolution Slider

Please send me a working link to the required plugins.