Thanks for your order of server 2019 standard. Please find below the link to download:
Please choose to install the version of “standard”. It installs an English evaluation version on your computer. After installation, please use the key we have already emailed you to convert it to full version.
To convert an evaluation version to an activated version, it is recommend to use powersell procedure to input the key.
To upgrade from evaluation to standard
DISM /online /Set-Edition:ServerStandard /ProductKey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX /AcceptEula