This is a bug fix release for the 3.x series of Joomla! which addresses a single bug that prevents new installations of Joomla! 3.7.4 with remote databases.
Joomla! 3.7.5 has been released to address a bug introduced in Joomla! 3.7.4 relating to the implementation of additional security checks in the install application designed to protect your web hosting account from being overtaken by a remote attacker. Note that this patch only changes one file in the installation folder so nothing changes for existing installations except the version number.
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We are familiar with the implementation of the upgrade and are currently upgrading multiple sites CONTACT US fora free proposal to update your site.