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Hi, Sezer. Thanks for reaching out! I'm an Independent Advisor and a Microsoft user like you, and I am here to work with you on this issue.
That's a standard message by Microsoft. Just an ad for the PS Core 6.0.
You can learn about about it on the following link, since the one showed on the PowerShell doesn't seem to work:
https://docs.microsoft.com/en-us/powershell/scr...
The last core version is actually the 7.0, that you can check out here:
https://docs.microsoft.com/en-us/powershell/scr...
I hope this helps! ;)