What software is required to view the PDF documents I purchase? Victoria (Phucas) Colangelo November 04, 2019 20:40 Updated Follow You will need Adobe Acrobat Reader to view electronic PDF documents purchased from the CLSI store. You can download a free copy of Adobe Acrobat Reader here. Related articles Where should I ask technical questions about the content of standards and guidelines? How do I access invoices and purchased PDFs? What are the system requirements for Infobase? What is CLSI’s copyright policy? How do I submit a purchase order?