News from VMware Official website, VMware VCP550D exam will only be offered until December 31, 2015.

Terms and Conditions of VMware VCP550D exam:

Only current VCP5-DCV candidates who passed the exam series VCP510, VCP510PSE or VCI510 are eligible.
The VCP550D exam can only be used for recertification if your recertification deadline is prior to December 31, 2015
Exam is not eligible for discounts. Training and Learning Credits cannot be used to purchase.
The exam must be completed within 48 hours of your registration with PearsonVUE.

Before you decide to take VMware VCP550D exam, you can practice your skills by the following free VMware VCP550D online test.