Hi...... I want to upgrade from PSE 9 to PSE 2019, can I do this directly and, would it be better to start from scratch with a completely new version
Each version is a separate program. You can keep several versions on your computer.
You are entitled to a special upgrade price if you already have a registered older version. Note that there can be promotion prices more advantageous than the upgrade price on big web resellers and event Adobe at times.