Note: this method requires some basic knowledge of transferring files using FTP / SFTP or Cpanel/filemanager.
First, download the theme installable zip file that was attached with the email.
If you are using cpanel/file manager, goto wp-content/themes/ folder and there upload the zip file and extract and replace the existing writer-blog-pro folder.
If you are using FTP / SFTP then first extract the zip file in your local machine and then goto wp-content/themes/ folder in your FTP / SFTP client and replace the writer-blog-pro folder with the newly extracted folder.
Make sure you make a backup of files and database in advance, just in case!
This method requires a file manager plugin. Goto Plugins->Add new and search ‘Advanced File Manager‘. This plugin was developed by modalweb. Install and activate the plugin.
After activating the plugin, click on File manager tab on your left panel and from there, goto wp-content/themes/ folder and upload the theme zip file and extract and replace the writer-blog-pro folder with the newly extracted writer-blog-pro folder.
If you still have any issues updating the theme, send us an email to firstname.lastname@example.org and we will help you to update your theme.