is there a way to redownload the trial version and just keep using that?
i uninstalled and redownloaded it with a new email but it didn't work

No, but you can buy it or try something else...

Stop being such a girl. Go to isohunt -dot- com, then search for Guitar Pro. Find one that says cracked or something along those lines. There you go, no payments necessary. If that site doesn't work, try thepirateebay -dot- org

Just use TuxGuitar.