To manually update your theme, you can do this through cPanel, or with an FTP client.
Essentially what you will need to do is download the latest version of our theme from ThemeForest and replace the old theme folder with the new one via an FTP client or through cPanel.
So login to your website with an FTP client, or through cPanel and delete the old theme and then upload the new version of CityLister. Make sure that you have a backup of the old version of your theme, just encase something were to go wrong (then you can re-upload the copy you have).
If deleting your old theme makes you nervous, you can rename the old version of the theme. This will allow you to upload the new version of CityLister, so essentially what you want to do is:
- Login to your website via FTP or cPanel and navigate to wp-content/themes/ and find you old version of CityLister.
- Next rename this version of CityLister (put a number on the end).
- Upload the new version of CityLister you downloaded from ThemeForest.
Now when you navigate to Appearance > Themes within WordPress, you will see both versions of CityLister, and you can distinguish the two by their names and version numbers.