Solution : https://service.sap.com/sap/support/notes/1505457 (SAP Service marketplace login required)
Key words :
downtime optimized support package stacks implementation enabled, lower releases apply support package stacks, support package stack implementation evolved, required sap application product fixes, latest sl toolset support package, /swdc -> download -> support packages, supported sap application releases, sap enhancement package installer, updating sap systemsyou run, / software update managernews compared