What want you change?
With the Acrobat program. The inexpensive PDF Pack doesn’t give editing.
As shared by TSN, PDF Pack doesn't include editing feature. Since you are willing to edit a PDF document in that case you need to get the subscription for Adobe Acrobat DC. Adobe PDF Pack is a bundle of Adobe Document Cloud services. With it, you can access tools, manage documents, and track the ones you've shared for viewing, review, and signature.
Here is a list of all the services that you avail with the PDF Pack: Using Document Cloud Web apps and services | Adobe PDF Pack
Hope this answers your query.