Studio '13 Activation Problems

I've installed Studio '13 and the updated Studio '13 to my home computer. I have installed the same versions on my work computer but the system tells me that I exceeded my licenses and so I can't activate my product.  Is it because I downloaded the updated Studio '13 version too? Was I supposed to uninstall Studio 13 and then install the updated version?  I thought I could have it on two machines?

Any help would be greatly appreciated!

Tj

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