download exported whatsapp chat after expiring download link

please help me on following issue-

1. I had exported a whatsapp chat from my previous iPhone 6s to my mail ID on 16/05/2018.
2. It is now not downloading as the due date of down loading 15/06/2018 has been expired.
3. Since I was not aware of expiry , I could not do it.

Please help & guide that how can I recover ? its very important for me.