Take a look at the following thread. OVA deployment - "Transfer failed: The OVF descriptor is not available" It has a lot of possible solutions.
Hi , RvdNieuwendijk
thanks for your information , I have tried the workaround and restart the content-library service . Unfortunately , the problem persists .
Is there anyone upgrade to "VMware vCenter Server 6.5 Update 1d" and resolve the problem ?