Purchasing 3-Computer License will give you three more authorizations on top of the original one, i.e. a total of 4 computers on which you can use.
When purchasing 3-Computer License, please be clear:
1). The 3-Computer License is valid for the same period as the purchased product.
2). Device authorization is divided by Computer Operating System. 3-Computer License for Windows systems cannot be applied to Mac OS.
3). You can confirm how many computer licenses you have on Member Center > Lisence.

Extended Download Service ensures you be able to download (at Member Center > Extended Download Service) the standalone offline installer of nearly each and every history official release, whether minor or major version, anytime later just in case you need to reinstall a particular version of the StreamFab software you've purchased. If you don't choose this service, you can still re-download that specific version when you purchase, but only for a limited period of time until a new version comes out. With only $9.99, that limitation will be lifted for good, you can redownload any official release anytime you want.

Amazon Extra Download Pack allows you to increase your daily download limit to 200 videos.