Dear Vinay, 

Yes, ISI Admit Card has been released since 15 April, 2019 .

And you should get a Email and a link through which you'll get your Admit Card. 

But since you do not get the Email, you shoul log in by providing your username and password. 

To download the admit card, candidates will have to enter their username and password. In case the candidate is downloading the admit card through the link received on his/her email id then ISI registration number has to be entered.