migrate registration system

<%- if @topic_view.topic.tags.present? %>
<%= t 'js.tagging.tags' %>: <%- @topic_view.topic.tags.each do |t| %> <%= t %> <%- end %>
<% end %>

Silverstripe Version:

migrate registration system from silverstripe 4.1.2 version to silverstripe 4.7.2 version:

How to migrate registration system from silverstripe 4.1.2 version to silverstripe 4.7.2 version