Read this guide.
Download the ISO here:
https://software-download.microsoft.com/download/sg/17763.379.190312-0539.rs5_release_svc_refresh_SERVER_EVAL_x64FRE_en-us.iso
Flash it using WoeUSB on Linux or Rufus on Windows.
Follow the installation steps.
You should be able to change the edition using DISM.