Lost old downloaded EM client

How to get back my eM client. I have downloaded new through MS shop list.
Order No: 118640345 dated April 16, 2020
Invoice No: BV45248337 dated 16.04.2020
Can you get back my old one from your server. I have lost all my earlier mails
This happened during updating software and battery power went off. When recharged I found eM client missing

Help me as the mails are very important