Hello Prosenjit,
It seems that this is an issue on the Pearson Vue Site which your exam is not responding for the download or might be a technical issue.
As per the Exam FAQ of Pearson Vue, if you have encountered any technical issue before, during or after the online exam, you may need to contact the Pearson Vue Customer Support.
I would recommend to contact your exam provider directly to conduct some investigation and may assist you in rescheduling your exam since you have missed to attend your scheduled appointment.
Please see contact details below.
Contact: 855-542-6924, +1-952-905-7472 (toll)
https://home.pearsonvue.com/microsoft/contact
If this solves your problem, please indicate “Yes” to the question. If your inquiry was not fully resolved, please post a new question so we may continue in assisting you. This case will now be closed and locked.
Best regards,