Hello,
i am also facing same challenge at the moment. i cant log into my mt5. when i put in my details, it says connection to <not mql5.com> failed.

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Suddenly one day after I started my computer, my MT5 wouldn't open anymore. Nothing new/changed, it just won't open anymore. (It was updated to the latest version) My OS is Windows 10.
I have already tried restarting my computer and opening it in Administrator mode.
My biggest concern are my custom symbols I have created over the year. Is there any way to move the custom symbols to another MT5 program? I have already tried moving the "Customs" folder content to the new program but it won't recognize any "new" symbol.
Any help is appreciated.
Thanks.