In Pentaho Data Integration what is Update Partition Plugin?
I tried PDI tool version pdi-ce-9.3.0.0-428 and I'm getting the error for Update Partition Plugin
You seem to be using PDI with files created in the past or by another person. That file was created using a step that was not available in the stock software, but added when adding a plugin to the PDI installation.
I've googled for a plugin going by that name, but I haven't found it with a quick search. Maybe the people providing the file (transformation or job) can be able to help you to install that plugin.