Microsoft no longer provides direct downloads for this product via public links, but legitimate sources include:
Windows Update servers for 2012 R2 still function but will not receive new security patches after Oct 2023. windows server 2012 r2 essentials iso
Since Windows Server 2012 R2 Essentials is end-of-life, evaluate these options: Microsoft no longer provides direct downloads for this
For organizations currently running infrastructure provisioned by this ISO, the recommended path is migration. the recommended path is migration.