Update: I re-downloaded the launcher from the website using the "free download manager" that someone mentioned in another thread, and the files weren't corrupted, and it works now!
I tried installing the game, but first when trying to unzip the file, winrar warned me about the models.cpk file.
Then I used the launcher and tried doing a "Full Check", but after trying to launch the game, it freezes and doesn't start. I tried doing "Full Check" again, and it told me the "models.cpk" file was corrupted again.
Is this happening for anyone else, and does anyone have an idea how to fix it?
Try to unpack rar archive with 7zip.