Composer not finding the version

Hi I bought a free social login from : https://marketplace.magento.com/weltpixel-m2-social-login.html and it seems the every version that I ask to install I get : Problem 1 - Installation request for weltpixel/m2-social-login 1.10.1 -> satisfiable by weltpixel/m2-social-login[1.10.1]. - weltpixel/m2-social-login 1.10.1 requires weltpixel/m2-weltpixel-backend 1.10.1 -> no matching package found. Potential causes: - A typo in the package name - The package is not available in a stable-enough version according to your minimum-stability setting see <https://getcomposer.org/doc/04-schema.md#minimum-stability> for more details. - It's a private package and you forgot to add a custom repository to find it