Installing cs6 over cs4

I currently have Cs4, I downloaded it directly from Adobe, I have no Cd, I just have the serial numbers.
I have a year long internship and my boss wants me to download cs6 onto my computer. However, after this year I will have to uninstall c6s. I'm wondering if when I uninstall cs6, I will not be able to have cs4 on my computer anymore? And I'm not sure if cs4 is still downloadable from Adobe? I'm just worried that I will no longer have cs4...

You do not have to install CS6 over CS4. You can have both on the machine.
CS4 is downloadable from Adobe and it should remain that way for a long time to come. There is also an alternative site where you can download the trial version and activate it to full use with your serial number. The links for both are provided below. For the second you need to follow the instructions carefully for the downloads to work.
Adobe:
CS4 - http://helpx.adobe.com/creative-suite/kb/cs4-product-downloads.html
ProDesignTools:
CS3 and CS4: http://prodesigntools.com/download-adobe-cs4-and-cs3-free-trials-here.html

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