Remark: This article is valid for Royal Server V4.
Basically, Royal Server V4 can be operated on a headless Windows Server Core installation (i.e. without the desktop experience installed).
As one of our 3rd party libraries relies on the presence of the "Tahoma" font family, there is a prerequisite to have these fonts installed, which are not included in Windows Core. Without them the Royal Server Configuration Tool will throw an error on startup and you will not be able to configure the necessary license and Worker Account.
First, copy the required font files from another Windows installation to c:\windows\fonts:
Then you need to register the fonts with Windows:
powershell.exe -NoProfile -Command New-ItemProperty -Path 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts' -Name 'Tahoma (TrueType)' -PropertyType String -Value tahoma.ttfr powershell.exe -NoProfile -Command New-ItemProperty -Path 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts' -Name 'Tahoma Bold (TrueType)' -PropertyType String -Value tahomabd.ttfr
After this you can install Royal Server V4 and run the Royal Server Configuration Tool to specify a license and a Worker Account.
Remark: Windows Server Core is not in the list of supported Operating Systems so it might work but is not fully tested by us. See https://support.royalapps.com/support/solutions/articles/17000027797-system-requirements-for-royal-server for the list of supported operating systems.