So I have Halo PC and installed it onto my computer and I had to change computers because it was quite outdated. Anyway I had a friend put all the files from it onto a USB in a folder called Halo, but she said that she had a version of Halo that was better. So she put her Halo on my USB instead. Then I put it in c/my documents/sarah/games. I have been playing it on and off now for ages and today I tried playing multiplayer for the first time but the server screen had nothing to join and down the bottom it said I needed to download an update. I tried but the webpage apparently didn't exist. I checked a few times and I didn't put it in correct. Anyway I found a file that said update, so I tried running it but it said that I need to install Halo first. If anyone has any advice on what to do then could you please tell me what to do? I've lost the disc somewhere so I can't use it.