PDF files are not showing full functionality. using Windows 11. Buttons do not display, and placemarker for button when depressed does not display charets as it is supposed to do. Hyperlinks do not work that are supposed to move charts from one month to three to six, etc. These features work under Adobe Acrobat Reader and Editor v. 9.0. I am using the online version, which had t be set up by Microsoft. My version 9.0 will not work under Windows 10 or 11. The current Adobe version is an inferior product compared to v. 9.0 editor. I want to be able to use 9 as the default PDF reader/editor, but Windows will not allow it. Microsoft was able to get Adobe recognized, but it took over an hour of our time, and they could not get Adobe 9 recognized.