As this is a major release of Easyblog 6, you will need to download the launcher/full installer from https://stackideas.com/dashboard then manually upload this installer from your site backend "Upload & Install Joomla Extension" page and proceed with the installation.

If you need help with this Easyblog update on your site, perhaps you can update your site backend and FTP access by editing on your first post so we can better have a check?