Production Premium CS5.5 no valid certificate on download

Question

I have a Production Premium CS5.5 license and have the serial number, and recently had a laptop crash and am trying to install on a new laptop (and can't access the old one to delete the files).  But when I download Production Premium CS 5.5  from the Adobe site and try to install on the new MacBook, it says that the certificate is invalid and won't install it.  Any suggestions?

kglad · Accepted Answer

10.12+ is not compatible with older software, but adobe's posted a work-around: https://helpx.adobe.com/creative-cloud/kb/install-creative-suite-mac-os-sierra.html

kglad · Answer

if you meant to say you're seeing an invalid serial number:

assuming you're using a valid adobe serial number (6 groups of 4 numbers), you have a mismatch between your installation file and serial number. ie, you can have a valid serial number, but if it's for program A and your installation file is for program B, you will see an invalid serial number message.

common mismatches are language/region (eg, serial number is for western europe and installation file is eastern europe), platform (eg, serial number is for a mac and installation file is win), license type (eg, education vs enterprise vs individual).

and one of the most common is using a program installation file with a suite's serial number. eg, using a cs6 suite serial number with a photoshop cs6 installation file. that won't work even though photoshop is included in that suite. you must use the (correct) suite's installation file (and you can choose to only install one program from the suite).

here's official info about that error, http://helpx.adobe.com/creative-suite/kb/error-serial-number-valid-product.html

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