Opencart Journal 2 installation problems. Help needed!

Hi, I have Opencart v2.1.0.2 on my hosting server. l purchased Journal theme latest version which is listed as compatable with my OC version.Having followed the video instructions, l’ve gone into ‘File Manager’ and have uploaded the zip file to my websites ‘Public’ directory. I have then right clicked the file and then clicked ‘uncompress archive’. This should then integrate the Journal files into the four existing Opencart folders ‘Catalog’, ‘System’, ‘Image’ and ‘Admin’. This seems to have occurred as ‘Journal 2’ is evident within these.
When l then go to my website admin >Extensions>Modules> 'Journal 2 > click ‘Install’ l then get the message ‘Make sure you have uploaded all Journal files to your server and successfully replaced system/engine/front.php file.’. I have followed the installtion instructions accurately and uploaded the zip file ok so don’t know what to do. Can anyone help?

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