Please keep in mind, once you purchase your product you will receive an one time link to download it. Please make sure you open it on the device you need it. Each link is only good for 24 hours (Don't worry though! I can always send you another one, email me with your order number).Once you download the file to your computer, you will have access to it all the time.All my files are in pdf form which means you need Adobe to access them. Head over here to make sure you have the latest update. I recommend not installing the extras that come with Adobe- just Adobe itself. Some products in the Market are zip files (compressed). This means you need to unzip it before you access the file. If you don't unzip it, you'll get an error message. To read more about how to unzip a file, please see this site.