[ Thanks to Falko
Timme for this link. ]
“1. Get the zip file with all PuTTY binaries
http://the.earth.li/~sgtatham/putty/latest/x86/putty.zip“2. Generate a private and public key pair
Open PuTTYgen.exe, press Generate button, move mouse. Once the keys
are generated, type your key passphrase (choose a “hard to guess”
one). Save Public key. Save Private key.”