The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From GraphPad Software, Inc.:
Open any .pzf or .pzfx GraphPad Prism file from Mail, web site links, or cloud services (iCloud Drive, DropBox, Google Drive, OneDrive). GraphPad Prism, available for Windows and Mac, lets students and scientists create scientific graphs, fit curves with nonlinear regression, run basic statistical tests, and learn about data analysis. Learn more at www.graphpad.com/prismThis iPad viewer, which requires iOS 8 or later, will let you view all parts of a Prism file: annotated data tables, info tables of metadata, results of statistical analyses and curve fits, graphs, and page layouts (which assemble several graphs). However, the viewer does not let you edit the files or export any pages.
The user interface has been enhanced to make the viewer easier to use and to let it work in portrait orientation. It can now view files created by GraphPad Prism 7, which can contain heat maps, three-way ANOVA results, FDR procedures used for multiple comparisons, dates (or elapsed times) as X values, more accurate (asymmetrical, likelihood) confidence intervals from nonlinear regression, as well as many other features.