No! You don't need to install them. Please check out the section below in the Upgrade TroubleShooting Guide:
Then, copy the installdir/apps/redmine/htdocs/files directory from the old installation to the new one. If you have installed plugins in the previous version, copy the directories from the vendor/plugins directory into the new installation area, in the plugins directory. Check that the plugins are compatible with the new version and run the following command:
ruby bin/rake redmine:plugins RAILS_ENV="production"
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