Theme ZIP files can be uploaded from Appearance + Themes + Add New + Upload Theme. Use the Choose File button to select the ZIP file on your computer. Unfortunately, WordPress isn’t able to manually update a theme if the destination folder already exists. To resolve this error, go back to Appearance + Themes and activate any other theme, in this example, we’ll activate the default theme Twenty Sixteen. Next, hover of the screenshot of the theme you’re updating, click Theme Details and then Delete in the bottom right corner. All of your theme settings and content are safely stored in the WordPress database and won’t be lost during this process.
To install the updated theme, click Add New + Upload Theme. Use the Choose File button to select the ZIP file on your computer. Finally, click Install Now and Activate to complete the update.
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If you have any questions, please, feel free to post a comment below.