You can get it here. We have been super busy with the resource rewrite past few months, to the point we almost had no time to make a stable release. But 4.2.9 comes with a ton of bugfixes and some small enhancements to the color smudge brush and layer split dialog. We hope you'll have fun painting!
Another bug fix release, Krita 4.2.8 brings fixes to vectors, improvements to the transform tool and more aggressive checks for saving on windows. We'll be continuing bug fix releases, with the biggest fix the rewritten resource management that we're preparing for 4.3.