You can add this line:Signal::send('ticket.before.delete', $this); // Archiver plugin: Added to archive tickets before deleting them.To line 2699 of that file. You will find this is under the first 2 lines mentioned in the Readme file. Otherwise just search for "function delete" and make it look like it does in the Readme.Alternatively, you can apply this using a PR of mine by using these 2 commands:git remote add perryk https://github.com/perryk/osTicket.gitgit pull --no-edit perryk mod-enable-plugin-archiver