The procedure to register your TAN at www.tdscpc.gov.in is available here
So Now you can not download your form 16A from TIN-NSDL website . Other feature that has been transferred to new site www.tdscpc.gov.ic(TRACES) has already been explained to you in the Link.
FAQ How to register at traces (www.tdscpc.gov.in)
Detailed Procedure How to download Form 16A From the TDSCPC website is given in the link
How to download Consolidated FVU from www.tdscpc.gov.in is explained here