Just a little TIL: if you are trying to upgrade an elasticsearch install from 8.14.x to 9.0.x, the installer will happily quit out and tell you to install 8.18.x first, THEN install 9.0.x

However your system will now think it has 9.0.x installed so attempting to install 8.18.x will fail.

Have fun!

#TIL #LostAnHour