The vCenter Converter is back! The VMware vCenter Converter team invites you to communicate your interest in joining the continuous vCenter Converter Beta program. If you want to participate - just shoot a mail to email@example.com.
You can also visit the vC Converter Beta community page.
I have downloaded from this link.
but first of all you must register beta program and than login.
The vCenter Converter Standalone 6.3.0 is available now.