Titan15: When installing DLC, an error appears: "This version of the base game in not supported. Please update your game version with the latest patch.". But at the same time I have the latest version of the game installed.Windows 10
Check the version numbers of the installer files. Latest version is 2.2.4.17449.
Here are the names of the latest files: (Base game and DLCs)
setup_northgard_2.2.4.17449_(64bit)_(38990).exe
setup_northgard_-_svardilfari_clan_of_the_horse_2.2.4.17449_(64bit)_(38990).exe
setup_northgard_-_lyngbakr_clan_of_the_kraken_2.2.4.17449_(64bit)_(38990).exe
setup_northgard_-_nidhogg_clan_of_the_dragon_2.2.4.17449_(64bit)_(38990).exe
setup_northgard_-_himminbrjotir_clan_of_the_ox_2.2.4.17449_(64bit)_(38990).exe
setup_northgard_-_svafnir_clan_of_the_snake_2.2.4.17449_(64bit)_(38990).exe
If you don't have exactly that files, just download them again. It should work after that.