It works for me (I just opened demo accoungt on MetaQuotes-Demo).
About webterminal in general:
Ask your broker for web terminal link.
More about it in the announcement - https://www.mql5.com/en/forum/449944
More -
Forum on trading, automated trading systems and testing trading strategies
MetaQuotes, 2021.11.11 12:23
Ask you broker please to update web terminal in their side and provide the link to you.
Now each broker have to have it own web terminal.

MetaTrader 4 and MetaTrader 5 web terminals moved to new address
- 2023.06.30
- www.mql5.com
The old web terminal for both platforms at https://trade.mql5.com/trade is now available at https://metatraderweb.app/trade...

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Hello I am trying to get on the MT4 web terminal and when I try to launch the site it is not working. Is there any new updates? This is the site I was launching.
https://metatraderweb.app/trade