No, you either have to buy the DLC, or downgrade your game to a compatible version.

It will become one of those "essential" add-ons, just like Poland Rebuilding or Project Balkans used to be

Exciting stuff, can't wait to move my garage to Hradec if it gets one

Of course it'd be completely unrealistic, but it's technically possible, just not replacing the current Netherlands in the map

I remember seeing some standalone maps pasted into the normal world and connected via ferry, but I don't know how feasible that would be

When Czech language is enabled in game, with the localized city names option checked, there are some errors in translation of ProMods city names, most of them appear to be in Slovakian instead of Czech, here are some I noticed: Slovenia: Ljubljana should be Lublaň, not Ľubľana Poland: Bielsko-Biała ...

I would also consider the upgrade of vanilla parts of France and Italy an update to the base map

As long as they allow autoparking I'll love them even though I'll give up after ten minutes