I'm trying to install my copy of CS5 under CS6 because my new Canon Pixma Pro-10 will not install a plugin of PrintStudioPro in CS6 but does install it in CS5, but the Adobe website says my SN for CS5 is correct but will not recognize it. Where do I turn? This question is not addressed by any of your question options. I have had a registered copy of Photoshop since v2.0, skipping CS4. Now where do I turn? phone 808-455-1626, or email: firstname.lastname@example.org. Please help!
And what actualyl is the problem? Does CS5 refuse the serial? Your blurb is confusing. If it's merely an install issue, run the Creative Cloud Cleaner Tool and install the programs in proper order, starting with the older version.