After buying, you will receive a link which will allow you to download the package. You can then move the package to your computer with FSX and install it there with the information provided in the email or the last screen of the purchase.
For latest planes (C195 and after, released after January 2014), you need to be connected to the internet in order to be able to install the product, also be sure to run the installer as an administrator, right click and selecting "Run as Administrator".
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