the site is under maintenance. you can get clover from here directly https://sourceforge.net/projects/cloverefiboot (chameleon, stolen and rebranded)/files/Installer/if your still on windows then maybe download the iso then replace the clover binary in efi/boot and efi/clover with the iso ones https://sourceforge.net/projects/cloverefiboot (chameleon, stolen and rebranded)/files/Bootable_ISO/