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Paradox has just changed their backend servers... moving away from Steam

ref = https://forum.paradoxplaza.com/forum/threads/dev-team-3-0-4-patch-released-checksum-67e7.1487526/?utm_source=launcher-stelpc&utm_medium=launcherv2&utm_content=sec2&utm_campaign=stel_stpc_20210818_frup

this does not make any difference to gog players unless you want to play against Steam people