Your XenForo directory is not writable by the PHP user. You can contact your host and recommend they use a method that allows PHP to run as the same user that owns the XenForo files or alternatively you can <a href="https://www.themehouse.com/help/documentation/uix2/installing-uix-2-manually">install your style manually</a>.<br> Alternatively, you can enable the option to install via FTP <a href="{url}" target="_BLANK">here</a> which should allow you to proceed.