When you are using this PC trick use a proxy to hide your ip address as some sites will record your ip when you connect to them for security.
Now the step by step detail for this trick :
1) Right click your mouse (ctrl+click) view source and open the source of the site in an a text editor
2) Search for the word "return"
3) Next to it you can find the url for the thank you page
4) Copy the url and paste it in your browser and you will see the download link
This works only if you can download instantly after payment, it will not work if the link needs to be emailed to you.
Use this trick and start download your application without filling you Credit Card detail .