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we have big problem to upgrade the SCCM from SCCM 2012 R2 to SCCM CB1511, as we cannot download and find official iso to from
Microsoft Volume Licensing Site
upgrade.
SCCM CB 1511 has expired and out of support. The latest baseline of SCCM CB is 1802, so you could upgrade to 1802 then in-console update to the latest version 1810.
The 1802 baseline media is available as part of the following releases on the Volume License Service Center (VLSC):