The downside is that your web server will have rights to modify your files – which may allow a hacker to do the same.
But the benefit is significant in that you can patch security vulnerabilities via the web interface through upgrades.
You can download the latest version of your theme in your My Account dashboard.
The easiest way to manually update your theme is to upload it via the Word Press dashboard. The reason for this error is because you already have a theme folder on your server with the same name as the folder inside your ZIP file.
Attention: Version 2.0.0 changed the functionality of the plugin.