GitHub will not return any release data if there is only a tag with no release info (button [Draft release]). The ajax_catalog_install.php does a fallback to get the tags then, but there are two errors:
count() on wrong array
$tags is a multidimensional array, so $tags['zipball_url'] is wrong
GitHub will not return any release data if there is only a tag with no release info (button [Draft release]). The ajax_catalog_install.php does a fallback to get the tags then, but there are two errors: