Extract the client
Use WinRAR or 7-Zip and keep the client in a normal folder, not inside Program Files.
Client Files
Download
Get the game client, check the install notes, and join Discord if you need help.
Full Client Mega.nz
Download ClientFull Client MediaFire
Download ClientRun launcher as admin
Let the launcher patch files before entering the game.
Antivirus note
Some MU clients trigger false positives. Add the game folder to exclusions only if you trust your download source.