Please follow these steps:
Backup wp-content directory and all other important files inside your WordPress installation.
Also, backup your website database (this option should be available in your hosting account management panel).
You need to tell visitors that the website is under maintenance at the moment. Create a file ”.maintenance” in the root directory of WordPress. This will show “maintenance” message to your visitors instead of the website pages. Put the following content in it:
$upgrading = filemtime( __FILE__ );
Make sure that you didn’t modify files in this directory:
If you did change files in the above directories, please backup those files. You will need to merge your changes into the updated files after update.
Please make sure that you have backed up your WordPress database and files before you proceed. Please refer to step 1.
Replace the following directory with the directory “getting-married” from getting-married-wp.zip file inside the themeforest theme package.
Delete ”.maintenance” file that you created in step 2.