I would recommend removing all your old files first from where you want it installed. Then upload the phpNuke 8.1 files. Re-edit your config.php with the database settings. Then upload the upgrade scripts and run them sequentially to get from 6.5 to 8.1
Your best be is if you wanted to upgrade, then upgrade to raven nuke, its more secure then phpnuke 8.0+, Its phpnuke 7.6 which is by far the most secure version of Nuke also it has Sentinal pre installed. Its well worth taking a look into.
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