Copy the contents of the plugins folder to C:\bitnami\redmine\apps\redmine\htdocs\plugins.Copy the contents of the files folder to C:\bitnami\redmine\apps\redmine\htdocs\files.Copy the configuration.yml file to C:\bitnami\redmine\apps\redmine\htdocs\config\configuration.yml.Copy the notes and tasks folders to c:\bitnami.Now go to Instance, Startup/Shutdown and stop and start the service.Now, allow remote connections to the database by going into Instance, Options File, scroll to the bottom, and under General, uncheck the bind-address and click on Apply.
You can find the password in the following file: C:\bitnami\redmine\apps\redmine\htdocs\config\database.yml
This guide covers basic administration tasks for a Windows Bitnami Redmine Installation and Upgrade steps.