1- Launch the Linux instance in AWS https://dev.to/its_mukeshp/launch-ec2-instance-in-aws-4f0o and download the .pem file in your computer.
2- Download the PuTTY and PuTTYgen from https://putty.org
3- Open PuTTYgen then click on load and select the .pem file from your computer and then click on Save private key. Name the key accordingly the key will be in .ppk format.
7- Click on Browse and select the .ppk file form your computer.
8- Click on Open, one window will open click on yes.