I purchased one month of Adobe PDF Pack. First, I tried opening a pdf saved to my computer. PDF Pack software returned a message that my pdf file format was not supported. The reason I purchased PDF Pack was to easily delete and insert pages f

PDF Pack does not delete pages. It can be used to combine entire PDFs, provided they are not forms and are not protected. But doesn't sound as if you purchased the right thing. Maybe Adobe Acrobat is what you needed.

But... is this a file you can open normally in Adobe Reader? It sounds if maybe you cannot do that?