Greetings, 2Repairshop and Vakito.
Welcome to the QuickBooks Community. We're constantly working to improve our product, so I'm glad to share some information about the pop-up message you've encountered.
The message was sent to inform all QuickBooks users to meet all the needed system requirements (Operating system, Internet Explorer and .Net framework) after May 31, 2018. This will provide greater security and stability to prevent any issues with the service.
Check out this article for additional information: Operating System, Internet Explorer and.Net framework requirements for QuickBooks Desktop 2015 and l....
Let me know if you have further concerns. I’ll be here to answer them for you. Have a good day!