In order to your pdf-swiss-knife account, you would need to download a utility from here. It does not require an installer. Just copy it into some convenient folder and run it from there.

Once you are through with your account, just simply delete the utility from your computer.

You can also run the utility from any number of computers. No restrictions. You can even re-distribute it if you feel like. In fact, you can download it and check it out before you purchase your account space here.