Hello,
I have gone through the requirement and understand that you would like to recover files from aws instance which you dont have key. I prefer to use "Putty" to access the server. If the server is access from Ec2 connect in web browser then we can copy the data.
Since, you dont have a key, we can approach below method to access the data.
1. Create AMI of the instance
2. Launch instance from AMI
3. Create new pair at the time of launching
4. Recover the data from new instance.
I am available now and generally will be available between 9:00 AM IST to 11:00 PM IST. If you want me to be available in different time then please let me know.