The map of Silesia is an addition to the map of Fictional Poland (Fikcyjna Polska). So for this map you need all DLC and of course Fictional Poland.

@Arayas I'm sorry. I did not notice that the post is used earlier

Do you understand that there are currently no solutions for these cities in southern Polish countries?

Where is Rzeszów?Why there is no Rzeszów to use Roex and PR

Where is Rzeszów?? Why there is no Rzeszów to use PR and ROEX