Encountered the same issue, the actual content of SW_binaries_for_Xperia_Android_10.0.7.1_r1_v12b_seine.zip is:
<?xml version="1.0" encoding="UTF-8"?>
<Error><Code>AccessDenied</Code><Message>Access Denied</Message><RequestId>QXA3ZB2DBQN8ZDFS</RequestId><HostId>n7eBn7r2aHmMFHH0EfvnLHJJfPJg9FCjNdXdPn0WYOCDxOyhq050UffAE4dTdnAb1wg5OOUEkocgvIiWNgDB5oVoSnQ+K6oU</HostId></Error>