To download your logo in high resolution:
Log in at https://app.logo.com/dashboard
In your Dashboard, in the top left, click on "Downloads" (under Home)
Under "Most Popular" you will see "High-resolution logo"
The default format is the .png high-resolution version but you can click on "Formats" to choose other formats.
Note: jpeg is older and more well-known, it is not the best high-resolution format. PNG is a modern, recommended high-resolution format to use.