If you're using Hotel Master theme, please read this : https://goodlayers.ticksy.com/article/12190/ 

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Updating Layer Slider - Tourpackage since v2.00

Answer

1.) After you download theme package from Themeforest, Extract the package and go to folder 'THEMENAME-vx-xx'

2.) Go to the path, 'include/plugin/tgm-plugin-activation/plugins/layerslider.zip'

3.) Extract the file then copy the folder 'layerslider'

4.) Access to your site via FTP, to the path 'wp-content/plugins'

5.) Replace the existing folder in this path with the one you copied from 3.)