I have  PS CS4 Extended. When I start it I get a message that I need to reinstall it. I search Adobes and found a download for Mac which I installed and when started entered myserial number. It was not accepted. Any tips?

The file downloaded is named NikCollection_1.2.8_0511-456.dmg. The installation went ok but when I start photoshop i am prompted for my serial number,
I have it on the back on my CD case (but my CD is not  working any more) and it is the same number as it registered at my Adobe account.
Photoshop starts ok but after a while it prompts for my serial number. When I enter my serial number it is not accepted.
Grateful for any tips.

Did you go here for the installer? Download CS4 products
When you enter the serial number see that you get the serial number correct, in fact copy and paste from the one in your account.
You should see a green checkmark.
If all goes well you should be allowed to install and activate. If activation fails, contact Customer Care by phone or Chat.
Contact Customer Care

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