Installing smush it upgrade

Hi,
We have the free version of smush it added to our site. I have recently signed up to the free trial as I was wanting to test the benefits of the subscription before completely committing. However, I can't seem to upgrade the plug from the free version, it seems like I have to add in the new plug in to get smush it pro, is that correct? We don't have a full time development team so would be unable to have this added before the trial is finished.
Is anyone able to contact me regarding this so I can discuss our situation?
Thanks,
Alanna