Downloaded CS4 trial and says license expired so it won't run

I downloaded Photoshop CS4 trial yesterday and i tired typing in my dad's photoshop license code. It accepted it then said it was expired. Now photoshop won't open. I tired getting the trial under another email address after i uninstalled the the first trial I downloaded and the new trial still said license expired. Please help. I don't know what to do. Any suggestions?

If your dad is using both of his activations then you just screwed up the trial. Once the trial is expired then you are out of luck. the only way to reset a trial is to completely wipe your hard drive and reinstall the OS fresh. then don't enter any serial numbers.
Photoshop is a single user license that means that if you install your dad's photoshop you are breaking the EULA.

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