I’ve had some trouble installing DHCP at a customer’s 2012R2 Essentials server. Every time the installation would fail claiming the server needed a restart. After a restart it still needed a restart and so on.
After a while I noticed DHCP was installed, the management tools and the service itself and worked after I configured it.
This ran fine for a month or two when suddenly, one morning, the management tools and the DHCP server service were gone.
I have tried to install it again and rebooted a few times, no dice. However this morning the management tools and the DHCP server service are back again. (settings gone however).
Now I’m a bit affraid this will happen again. Could it be that DHCP is already marked for removal? Since the installer never properly finished? Maybe a DISM cleanup that removes it?