That is't I want to know if the manual is updated for multiserver installation instructions for Debian 10. Thanks!
It is not updated yet, we will make a new manual for ISPConfig 3.2 which will also contain new multiserver guides. As a Howtoforge subscriber, you can always download the current version of the manual here btw: https://www.howtoforge.com/download-the-ispconfig-3-manual Use the download button on the left side of the page, which is the one for subscribers.