How to install and play in a MoP server?

Hello, i'm new in this community. I want to start playing in a MoP server but idk how.

I've already donwloaded the instalation files from https://www.warmane.com/download... the problem is that when i execute the "WoW.exe" file in the main download folder i got this 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"

What should i do?

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"