Unable to install crucial built-in plugins

Hello,
After install the Betheme, I'm trying to install all the plugins, But I'm unable to install 3 of theme: Layer Slider, Slider Revolution & WPBakery Page Builder.
Every time I try it's stuck on "Unpacking the package…".
I tried to delete everything including the DB and clean up the site from the start - but it's still doesn't work.
Please advice

Shay Rotenberg

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