How to convert PUB files into PDF

I believe the free calibre 2.49.0 will do the trick. Be sure to read the following:

How to safely use MacUpdate to download malware-free software:

This site has both free and paid membership accounts. If you have neither then some software will be distributed as an installer wrapper that includes adware/malware you may not want. Such a download may appear on your computer like this: Firefox Installer.dmg. Delete the download and return to the main site where you will find a direct link to the developer's website. Use that link from which to download the software.

To avoid such downloads from MU just create a free membership account. Log into your account prior to using the site. This will avoid the installer wrappers and downloading adware or malware. I continue to use their site without any problems.

If you prefer not to create a membership account then note that on the download page under the price box will be the link to the developer’s site. Use that link and download the software directly from the developer circumventing the use of MU altogether.

You may be sent warnings from one user that warns that the site is “dangerous.” In fact my list of adware tools has no links to MU. His warning is an exaggeration and it is false. Learn the facts. You merely need to use the site intelligently. Support the site but do so wisely - establish a free or paid membership to avoid problems with malware. Don’t pay attention to other users who warn you away with hyperbole and rhetorical insults.

Not quite sure what you are asking. I have not used it in quite a while, so current version may be much different. But I believe it works like most programs with an Open File menu and a Save menu setting for converted files. Presumably, if no other folder is selected it will save the converted file in the same folder as the source file.

You can open publisher files in LibreOffice. Then export the file to PDF.