Not off to a great start... The "look how many steps it takes to convert shareware users" is insanely overblown.

1-4. Google, find, read... this is the same for web apps. 2. Click download and wait a few seconds. Not enough time to give up because native apps are small. Heavy JS web apps might load for longer than that. 3. Click on the executable that the browser pops up in front of you. No closing the browser or looking for your downloads folder. It's right there! 3.5. You probably don't need an installer and it definitely doesn't need a multi-step wizard. Maybe a big "install" button with a smaller "advanced options". 3.6. Your installer (if you even have it) autostarts the program after finishing 4. The user uses it and is happy. 5. Some time later, the program prompts the user to pay, potentially taking them directly onto the payment form either in-app or by opening it in a browser. 6. They enter their details and pay.

That's one step more than a web app, but also a much bigger chance the user will come back to pay (you can literally send them a popup, you're a native app!).