MoP Launcher doesn't start

Hey, i just downloaded the MoP Launcher from the Warmane website, but when i try to open the game, it gives me an error message.

"Data/enGB/wow-update-enGB-18273.MPQ: World of Warcraft can’t make a required change to an archive file. Be sure you have write permission for the World of Warcraft folder or try running the game in administrator mode. For more information, see: https://battle.net/support/article/6910"

I already re-downloaded it which was not so fun since its 30Gb and my internet isn't the best.
Maybe anybody who knows what could be the problem?

https://imgur.com/a/ZWmE8UA

Follow these steps:
1) Restart your PC
2) close your Torrent client and move your WoW folder away from your Torrent's download destination
3) now right click on WoW folder> Properties> remove "read-only"