If you want to download updated version on one computer and use it on other machines,
Do this :

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Download and install the latest Parallels Desktop 7 update: 

1. Download the update: http://www.parallels.com/products/desktop/download/dr/

2. Run the downloaded file and install Parallels Desktop 7.0.15104. Note: only Parallels Desktop application will be reinstalled, no Virtual Machines will be affected.

Courtesy : Parallels Website.

Hope I was helpful :)