To install the new SAP Fiori FES 3.0, you need to install SAP_UI 7.51, which contains SAPUI5 1.40.x and higher. You want to know which is the maintenance status for that SAPUI5 version.
SAP Fiori, SAPUI5
SAP_UI Addon 3.0, SAP_UI 7.51, maintenance, stable version, SAP Fiori frontend server 3.0, #SAPUI5 , KBA , CA-UI5-DLV , UI5 ABAP delivery tools , How To
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