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Since you already purchased a retail licensed CS6 product but just require the installer because your computer has no CD/DVD drive, you can indeed download the installers from Adobe site. During installation, you just need to provide the product key or the serial number of the license that you bought.
Please use the link below to get the download link for your Adobe CS6 Design Standard:
<< Download Adobe CS6 Here >>
In the CS6 Design Standard Download page, select the column for Mac and the language and you shall be able to download it and then install it on your Mac.
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