Played this moring no problems then
 

after loging out and shuting down PC log on 2 hours later. and now it says i am missing STEUP.DLL thing . and i can do this by reinstalling the game. AGAIN .
so i done that and wanna download V49 but cant REASON it says it a virus ??

Posted this on another thread, but I had same problem this morning and fixed it through the following...

Launch 'Windows Security' setting -> click ' Virus & Threat Protection' -> click 'Protection history'. From there I found a 'Threat quarantined' entry for the dsetup.dll file. I clicked the drop-down action to 'Restore' the file and everything started working again.