Apple today released a new update for Safari Technology Preview, the experimental browser Apple first introduced one year ago in March of 2016. Apple designed the Safari Technology Preview to test features that may be introduced into future release versions of Safari.
Safari Technology Preview release 41 includes fixes and improvements for CSS, WebRTC, Drag and Drop, Web API, JavaScript, WebCrypto, WebGL, Media, Rendering, Accessibility, Storage, Web Driver, and Web Inspector. Today's update also enables the File and Directory Entries API.
With Safari 11 now available in macOS High Sierra, Apple is providing two versions of Safari Technology Preview, one for macOS Sierra users and one for those using macOS High Sierra.
The Safari Technology Preview update is available through the Software Update mechanism in the Mac App Store to anyone who has downloaded the browser. Full release notes for the update are available on the Safari Technology Preview website.
Apple's aim with Safari Technology Preview is to gather feedback from developers and users on its browser development process. Safari Technology Preview can run side-by-side with the existing Safari browser and while designed for developers, it does not require a developer account to download.
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Redownload & installed from https://developer.apple.com/safari/download/ and it worked.