If you have managed to download the compressed files, the installation process is slightly different from a standard Steam or Battle.net install.

Highly compressed games are versions of video games that have been significantly reduced in size from their original form. This is achieved through various compression techniques that reduce the game's file size without compromising its core functionality or playability. These techniques can involve removing unnecessary files, compressing textures and models, and optimizing game code. The primary goal is to make the game downloadable and playable on systems with lower specifications or limited storage, making gaming more accessible.

If you own the game legally on or Steam , you don’t have to download the full 175GB right now.

: Opting out of high-resolution assets saves roughly 40 GB–50 GB of space . PC System Requirements

But then, a text box popped up. It wasn't a standard Windows error message. The font was jagged, green, reminiscent of old DOS prompts.