This would be the safe option and will avoid the Bloatware/PUP's that comes with those other apps available on the Web.
It is a really good DjVu viewer, then open your file in that application and click File - Print and use the Windows PDF Printer to convert the DjVu file to PDF. Hi Monika, what I would do is download WinDJView from sourceforge. MacDjView is a simple DjVu viewer for Mac OS X, also with continuous scrolling. DjVu is a web-centric format and software platform for distributing documents and images. It uses the free DjVuLibre library to decode DjVu documents. WinDjView is a fast, compact and powerful DjVu viewer for Windows with tabbed interface, continuous scrolling and advanced printing options. djvu files online right in the browser.It's written in ReactJS and powered with DjVu.js library. djvu files online.It's written in JavaScript and can be run in a web browser without any connection with the server.It's absolutely open source and you can see the source code on GitHubAlso there is the DjVu.js Viewer, which allows you to view.
DjVu.js is a program library for working with.