Hi Nikoch,
I've just tested the exporting feature with the P-58 database on versions 2.2.2 and 3.0.0 - both work fine for me on Windows 10.
So, let's explore what could go wrong on your machine. When clicking the export button, you need to select a destination folder. I usually create a folder for this purpose, but you could simply select one of the existing folders on your hard drive. It does not need to be a special path.
Are you running in a Windows or macOS environment?
Do the examples run fine within PBE? If yes, that confirms that the tool has access to the databases.
Depending on your answers to the above, I'll have more questions.
Adam