[2021] Surviving Mars - dlc not instaling

mr_liamo said: below and beond downloading but failing to install

This is a Steam error? Or what exactly please?

And from where did you get these DLCs?  

Click on this game in your Steam Library and go to manage My DLCs. Is this DLC listed there as installed and enabled?

If so, where exactly is it showing as failing to install?

Does a Steam Verify operation find anything to fix?