Visual Composer doesn't work

Hi,

I’m facing the problem like many users; though disable LayerSlider, the VC still go to the all-screen-white page and seem to hang.

I think now the VC has a new version:
Visual Composer – current version 4.3.4
but my WP cannot upgrade to the latest one. At the official site, there is no link to download. Please give me the way to update.

Thank you very much,
– Sarttra