I’m frustrated

"To open this file, please update your Guitar Pro Software" -I DON'T WANT TO UPGRAGE

I have just installed my old GP 5 onto my new laptop and every song I click on in my old files won't let me play it. I am told "To open this file, please update your Guitar Pro Software". I don't want to upgrade to Ver 6. How can I play my old GP 5 files?
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