For most tasks in life, there are several ways to do them. Some are easier because you have better tools. Others are harder or take more time.
Drive Explorer is not necessary to configure a Powerflex, although it would probably make it easier. You might even be able to run a drive without an HIM module, if you can use the factory default settings for all parameters. But a HIM module will allow you to set many parameters to fine-tune the drive for your exact needs.