Hi,
Follow the below steps for update the theme
Go to my account page of our site and download the updated theme and plugins.
We always recommend taking a backup of the old theme before updating the theme.
Then log in to your FTP or Cpanel. Go to wp-content/themes and upload the zip file you have downloaded. First, rename the existing theme folder then extract the newly uploaded theme.
While installing an updated theme, you just need to take a backup of the old theme. Add an updated theme and activate it.
This will not lead to the loss of the existing contents of your site.
If you need any other assistance, please let us know we are here to help you out.
Many Thanks