Reinstall WordPress from zero

Yes, you’re right. Steps need to do:

  1. Delete the db related to your WordPress installation( or you can just emty your db without deleting it. This option will save several minutes of your time to not creating another database )
  2. Delete all files related to your installation
  3. Upload another version of website, unzip it( if it has archived ) and call your website url from browser
  4. You’ll see fresh WordPress installation page:

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After filling required fields, you’ll got fresh WordPress installation.