How can i download the game?

[vatas]

I downloaded Java and named the file autohaven.jnlp but this hadnt worked . When I try to open it with Java it wants me to install Java se envrionment ( or something like this ) again and again and I dont come any futher . Can you somhow help me ? I downloaded Java Windows 64 and I've got Windows 10

64 that you said most likely means that java you downloaded is 64-bit. If your Windows 10 happens to be 32-bit, any 64-bit application or framework won't work.

[MagicManICT]

First, did you actually rename the file "autohaven.jnlp?" If so, you shouldn't have. Java will stop supporting this file extension soon, so Haven has changed the launcher to meet the updated standards. The file downloaded should be "autohaven.jar." With Java installed, double clicking this should run it automatically.

If autohaven.jar does not run automatically, and if you have Java properly installed, it could be that .jar was not associated with Java correctly. You should get the "run with..." dialog box when you attempt to open the .jar file. Either scroll through the list to find "Java Platform SE," or, if it isn't listed in the quick select, you'll need to navigate to where you installed Java at and find the "<current_Java_ver>\bin\java.exe" file. This will run all Java apps. <current_Java_ver> should be, at the time of this post "jre1.8.0_251" (if a person were to have the development version of Java, it would be "jdk1.8.0_251")