As shared above, that you are willing to use the "Organize Pages" tool. This functionality doesn't comes up with the PDF Pack.
You need to Sign Up for the Adobe Acrobat. As this is an open forum so the plan can not be change here.
In order to upgrade to the Acrobat DC you may please contact to our billing support team-contact-bumper they will go ahead and help you with the upgrade which might not be possible to do from your online account currently.
Let us know if it doesn't help you or any trouble getting assistance through support.