there are no arcgis js api 4.12 for download ????
https://developers.arcgis.com/downloads/apis-and-sdks?product=javascript
Yes, we will update the downloads page, probably in 1-2 weeks. We apologize for the inconvenience. See: https://community.esri.com/community/developers/web-developers/arcgis-api-for-javascript/blog/2019/07/03/arcgis-api-for-javascript-412-and-329#comment-75557
the download page does not have v4.12 for download
The API download does not become available for a week or so after the release of the API online.
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