I believe no official install script is available for Debian 10 Buster. But there is the installed vm image: https://www.howtoforge.com/perfect-...rtual-machine-image-download-of-this-tutorial I have not used either. If I had tens of hosts to install ISPConfig on, It would be worthwhile to examine and experiment with install script or the image until I get them working reliably on my setup. Installing just one is better done using the Perfect Server Guide, then the errors and failures can be seen and delt with, instead of getting an ISPConfig system that does not work and no idea about what went wrong.
There is ISPConfig official auto installer which should cover Debian 10: https://www.howtoforge.com/community/threads/ispconfig-and-perfect-server-howto-autoinstaller.82563/
FWIW, this installer is usable but not production ready yet; you might look over the issue tracker for a few things you might encounter. It would probably work a little smoother on a single-server system, many of those only apply to multi-server systems. But give it a try and report any issues you find.
