Before update plugin, Please export all your sliders and you can update plugin via Dashboard or FTP
Via Dashboard
i) Go to Dashboard / Plugins / deactivate LayerSlider WP plugin
ii) Delete LayerSlider WP plugin and Click “Add New” to Upload Plugin.

iii) Browse updated slider plugin and install it
Via FTP
i) extract codecanyon-1362246-layerslider-responsive-wordpress-slider-plugin-wordpress-plugin.zip file and copy LayerSlider folder

ii) Get into wp-content / plugins / and replace LayerSlider folder
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