I take it you can read in english if you are reading this, so be sure to read this article to know what I’m talking about.
Summing it up, you can’t print musicnotes scores to pdf unless you know how to. One of the “how to”s is in the article, written in a comment by Music Lover.
Here’s another way for those who can’t use command line (and please don’t use Music Lover‘s way unless you are used to work with command line!)
1) With the file open in the musicnotes software, click print.
2) In the drop-down menu where you choose the printer, choose “Microsoft XPS Printer”. If you don’t have it, I can’t do anything for you, sorry.
3) Click print and save the file
4) Convert the file to pdf here.
Any doubts? Make sure to comment below.