The pdfs on this site won’t download. I understand I can’t fill out the forms with SumatraPDF but now instead of the form I want I get a different pdf file that says I need to install Adobe Reader. I used to be able to downloads and read them. Is Adobe now creating ‘pdf’ files that only they can use?
Yes these PDF containers with self modifying forms are for Adobe desktop (Win/Mac) e.g.not 3rd party or adobe android readers
Examples of PDF software with some support of XFA rendering include Adobe Reader (for Windows, Mac OS X), Nuance PDF Reader (partial support),[ PDF-XChange Viewer (partial support),[Foxit Reader (partial support).
more info here https://en.wikipedia.org/wiki/XFA