Pardon my regardiness, but the description here says that there are two files and in the magnet link and mediafire one there is only one (the bigger one). Where's the smaller file?

Sorry for the noob question but how do you decrypt a SHA256 hash?

The hash is not for decryption. It is for checking the integrity of the downloaded file.

You don’t decrypt a hash, a hash is used to verify integrity of a specific content. You can use several programs to create a hash of the files you downloaded, and compare it to this person’s hash to see if they’re the same.

I wonder why Finder refuses to decrypt GTAVSP.7z, but I guess that's because it doesn't support 7z-specific crypto extensions.

can you tell why 7zip is showing password error again and again

Use the one in the password.txt file that comes along with the zip file.

*i was copying pass and pasting .. once i typed it worked thanks..

As chains of trusts go, this is utterly useless! Unless you’re about to post a picture of yourself with your HN username, today’s newspaper and a linked biog at a trusted domain that proves beyond doubt your integrity.