In FinaleScript, there is a Batch Save as Graphic. That might do it for you, since one of the Graphic options is PDF. I've used that to create my PDFs for years, although never as a batch.

Turns out that Finale also has a built in ability to mass-convert all of your Finale files to MusicXML. You want to watch this:

https://www.youtube.com/watch?v=PdpykIdXZBk 

XML is not the question here, but batch-conversion to PDF!

I tried it with Finale Scipt. Conversion to TIFF works very well, but to PDF, you have tot click Save for every file. Is there a better solution?

For the rest of the internet, people asking about PDF conversion are also asking about XML.

but to PDF, you have tot click Save for every file. Is there a better solution?

Scripts can be modified. If you look at the actual script, TIFF is the default—this can be changed. Look up Finale Script in the manual, you’ II find many pages. Some of the links give Robert’s deep dive into how this is done. You can do it in the Mac or Windows OS built-in scripting but this much better.

There are many conversations about this in the Dorico forums, too. It’s possible that someone has already posted the modified script that you want. I’ve been really busy and haven’t looked.

Turns out that Finale also has a built in ability to mass-convert all of your Finale files to MusicXML.

Which sorta works and takes hours if you have many files. I suggest you break them up into smaller folders first.