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


Updating Layer Slider - Modernize since v3.16

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/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.)