Unable to install valid Photoshop CS4 license

[rokepi]

Dear community,

I have an old Photoshop CS4 which worked fine for me for years.

Got a new computer, had to reinstall.

When I wanted to install it accepts my CS4 serial number,

but not my CS3 serial number, where I upgraded from.

Adobe Support could not help me.

Any ideas?

Thank you very much,

Robert

[Test Screen Name]

You must enter the CS4 product serial first, then the CS3 product as "qualifying product". If you had a replacement CS3 license without activation, you cannot use this license; you must use the ORIGINAL CS3 license. 

[AxelMatt]

Depending on the installed operating system on your new computer it's possible that you can't install CS4.

CS4 isn't compatible with the newer versions of Windows and MacOS