Here, things are a bit different.
There is a stable version, it is published here, and is available for free.
There is a beta version, in which errors in the code are gradually being corrected, and the localization is updated. Those who support the project financially have access to it, but the very first, buggy and partially localized build of the beta version of the game is usually published by pirates on their websites.
In parallel, a new version of the game is created. And when the new version of the game is ready, it is assigned the status of a beta version, and the current beta version is published as stable, because in 3.5 months all the main errors are usually fixed in it.
There is also a debug version available for the most generous backers. But it doesn't have any unique content, except for some debugging functions that can either make the gameplay easier or break the game in the wrong hands.
So if you play in Spanish, Russian, French or German, or just want fewer bugs, it's better to use the stable version of the game, which is available on this page.