I cannot open the downloaded file.

When clients download the entire collection, downloaded images are in .zip format. Most new computers should already come with some sort of unzip program, in which case they can just double click and it will start the unzipping process. Here are some common free unzip softwares that can be downloaded and installed if nothing is installed already on the computer.

For Window Machines:
http://www.rarlab.com/download.htm

For Mac:
http://www.zipeg.com

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