Thanks for the answer, Flamefire,
but still, it wasn't helpful, now it doesn't work at all
in logs:
ERROR: Some files failed to load.
Please ensure that the Settlers 2 Gold-Edition is installed
in the same directory as Return to the Roots.
Saeubere Texturespeicher: fertig (nach 0ms)
But S2 gold edition is installed in the same directory