I contacted technical support about 2.51, they replied to me with this, I think Blizzard is already in the know, but why are they taking so long to fix this error? Already one week has passed:
“Yes, we noticed that many players encountered a“ 2.51 ”error, the information has already been transmitted to the developers of the game. I hope that in the near future, the developers will comment on this situation in the American forum. Unfortunately, the support service is powerless here.
Continue to monitor the development of the situation on our forum, do not forget to look at the fixed topic “Beta Known Issues List”: https://us.forums.blizzard.com/en/warcraft3/t/beta-known-issues-list/7961
Thank you for your time and understanding. I hope that you will be able to enter the game at the weekend.
Remember that you will find most of the information on our support site using the keyword search in the search bar: Blizzard Support
I wish you a wonderful day and all the best! "