https://en.wikipedia.org/wiki/Windows_7
Support lifecycle
Support for Windows 7 without Service Pack 1 ended on April 9, 2013, requiring users to update in order to continue receiving updates and support.
[94] Microsoft ended the sale of new retail copies of Windows 7 in October 2014, and the sale of new OEM licenses for Windows 7 Home Basic, Home Premium, and Ultimate ended on October 31, 2014.
Professional currently remains available to OEMs, primarily as part of downgrade rights for Windows 8 and 10 licenses. OEM sales of PCs with Windows 7
Professional preinstalled ended on October 31, 2016.
[95] The sale of non-Professional OEM licences was stopped on October 31, 2014.
[96] Mainstream support for 7 ended on January 13, 2015.
Extended support will end on January 14, 2020.[97][98] On September 7, 2018, Microsoft announced that Windows 7 will get three more years of support after January 14, 2020 if users pay for the Extended Security Updates (ESU) service, however this only applies to users of the Professional and Enterprise editions of Windows 7.
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https://www.microsoft.com/en-us/windowsforbusiness/end-of-windows-7-support
https://support.microsoft.com/en-us/help/13853/windows-lifecycle-fact-sheet
https://home.bt.com/tech-gadgets/computing/windows-7/windows-7-support-end-11364081315419