It looks like you’ve come across a link for a "free download" of the . While the idea of jumping into a massive space grand strategy game for free is tempting, these kinds of "free download" sites are usually a gamble you don't want to take.

Stellaris has changed massively since its 2016 launch. A pirated "free" version is usually stuck on an old, buggy build and won't let you use the Steam Workshop (where the best mods are).

You won't be able to play with friends on official servers. The Better Way to Play