It was already discussed here on the forum for the last 2 days.
read two posts and one thread below -
Forum on trading, automated trading systems and testing trading strategies
My trading platform shut down alone
Sergey Golubev, 2021.09.08 01:18
Some users reported yesterday about their antivirus issue.
read post #10 and post #11
How to install clean MT4 and any build of MT5 (3 examples with screenshots): the thread
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once the metatrader app for PC is installed, double clicking on the icon does not open the app.
I have already tried to reinstall the application, restore the pc and change the operating system version from windows 11 to windows 10 but the situation has not been resolved