Need help "fatal error" on my Highend Theme

Hello I need help with the following code:

Fatal error: Call to undefined function vc_column_offset_class_merge() in /home/livelife/public_html/wp-content/themes/HighendWP/vc_templates/vc_column.php on line 16

I have updated all plugins and still see this. Also attempt to update revolution slider to new version and follow instructions here on forum. Dowloaded the link for the zip folder. The problem is once the folder is dowloaded and I am trying to upload from the “Manual Plugin Update” from the right bottom corner of the rev slider, I don’t know which file to select to update to the new version, there are many other folders.The plugin folder inside this folder has a lot of files. Which file do I select to update the rev slider? Please see screen shot for references and help asap please thank you!