I just bought CS5.5 "Upgrade Version"

I downloaded CS5 through my university and no longer have access to my serial number since I have graduated, therefore I can't install CS5.5 Upgrade Version.
Can I use a friend's CS4 serial number in order to activate/install CS5.5 on my new desktop computer?

LC,
It is possible to download many versions,the crucial part is the licence/registration number.
If you have or acquire a licence you can get access to an older version as shown below. If you buy a second hand version, make sure to get a licence transfer through Adobe:
http://helpx.adobe.com/x-productkb/policy-pricing/transfer-product-license.html
Here are Adobe pages for downloading CS6, CS5, and CS4:
http://helpx.adobe.com/x-productkb/policy-pricing/cs6-product-downloads.html
http://helpx.adobe.com/creative-suite/kb/cs5-product-downloads.html
http://helpx.adobe.com/creative-suite/kb/cs4-product-downloads.html
Adobe has started setting up a general set of pages for downloading (even) older versions (requiring  a licence) here, so far covering (at least) CS6 and CS5.5:
https://helpx.adobe.com/download-install.html
http://www.adobe.com/downloads/other-downloads.html
Until (even) older versions are added, this thread made by staff about downloading the old stuff, with its reference to the Prodesign Tools page is recommended (the last link goes back to CS3):
http://forums.adobe.com/message/5418120#5418120
http://prodesigntools.com/tag/ddl
It is crucial to follow all the initial steps precisely.

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