Qt 5.12.3 release is the third LTS patch release from the series has been announced and it comes with a number of bug fixes and other improvements.
You can find a comprehensive list of changes to this LTS Qt Framework version from the official release page here.
Qt 5.12.3 release is available for the update using the maintenance tool of the online installer. If you do not have it you can grab a copy from the Qt download page here.
Commercial users can upgrade from the account portal here.
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