Here's the section of the CS6 EULA that covers using previous versions: 5. Updates. If the Software is an Update to a prior version of Adobe software (the “Prior Version”), then Customer’s use of this Update is conditional upon its retention of the Prior Version. Therefore, if Customer validly transfers this Update pursuant to Section 4.6, the Customer must transfer the Prior Version along with it. If Customer wishes to use this Update in addition tothe Prior Version, then Customer may only do so on the same Computer on which it has installed and is using the Prior Version. Any obligations that Adobe may have to support Prior Versions during the License Term may end upon the availability of this Update. No other use of the Update is permitted. Additional Updates may be licensed to Customer by Adobe with additional or different terms.
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