You should re-install the product from the Market tab in Metatrader (delete old and reinstalled once again).
But read this thread before deleting/re-installing anything:
Windows 10 update and product license problems
Windows 10 update and product license problems
- 2019.01.28
- www.mql5.com
Hello, i've recently updated my Windows 10 system with the latest Microsoft release (10.0.17763...
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hi i update my windows to 10 2004 yesterday, i follow the guide reinstall my market purchased EA. and it reduce my activation count by 1, and i open mt5 today it sshows invalid license (538)
please help, thank you