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 that jpeg is older and more well-known, it is not the best high-resolution format. PNG is the modern, recommended high-resolution format to use.)