Windows Server 2012 R2 is out of mainstream support. Running Edge offline does not patch OS vulnerabilities. (Windows Server 2019, 2022, or Azure Stack HCI). Use Edge offline only as a temporary measure for essential legacy tools.
MicrosoftEdgeStandaloneInstaller64.exe --silent-install microsoft edge offline installer for windows server 2012 r2
https://c2rsetup.officeapps.live.com/c2r/downloadEdge.aspx?platform=Default&Channel=Stable&language=en&Consent=0&source=EdgeStandalonePage Windows Server 2012 R2 is out of mainstream support