In my experience, no, the WoTC adventures are not provided in PDF, so there is no way to read the adventure straight-through, page to page, cover to cover. All of the material (text and graphics) is in the Roll20 game that has it installed, but the info is spread out across Journals, Handouts, Character Sheets (2-3 tabs), Rollable Tables, map Pages (several Layers), and Compendium. Roll20's Compendium is very difficult (probably impossible) to navigate in a sequential page-to-next-page way, from what I've found, trying it. As a GM your best way to learn these types of Modules from a Roll20 purchase is, read all items under Journals tab in your roll20 game of it. OR, please check out non-WoTC modules because many other publishers provide a PDF of their adventure along with the Roll20 Marketplace product sale, and on those, YES, you can simply read the adventure normally.