After installing Windows 10 April Update (version 1803), you cannot save or print your document as PDF. In FrameMaker, when you try to save your document as PDF or print it using the default Adobe PDF printer, you are shown an incompatible printer error message:
Microsoft has released a new update for Windows 10 on July 24, 2018 (version: OS Build 17134.191). Install the July update to resolve the PDF generation issue.
To install this update (on your Windows system), go to Settings > Update & Security > Windows Update and select Check for updates. Alternatively, you can get a standalone package for this update from Microsoft Update Catalog website.