Use KeyRep 2.0 if you need a quick, repeatable macro within 10 seconds. Use AHK if you are building complex, bug-proof automation.
Assuming you have completed the and launched the app, let's automate typing a sentence. keyrep 2.0 free download
If you're looking for a free download of KeyRep 2.0, here are a few options: Use KeyRep 2