Note: The DLC for v0.5.9.10 is currently a free update for all owners of the base game. Do not pay for third-party "DLC keys" claiming to be for this version.
Because Ostriv is a premium early-access title (available on Steam and the developer’s official website), you must be cautious about where you look for the download. Here are the official methods: Download Ostriv -v0.5.9.10 DLC-
Even legitimate users face occasional problems. Here are the top three issues and their fixes: Note : The DLC for v0