As I read the documents, it is written that seafarer can apply online for the renewal for Indian CDC via the D G Shipping website online and it is done easily if all the documents are proper.

My question is, when should a seafarer apply for the renewal of the CDC? or Can I apply to renew CDC after its expiry? Is the process the same?
My actual question is based on the above and thinking what if I apply for the renewal of the CDC after it got expired. Is the process the same as a normal renewal process?

Is there are extra verification if renewal is done after expiry? Because I do not want to run to the cities or MMD office for verification in this period of lockdown...