I have EB installed over RTW v1.5 and I have also installed Barbarian Invasion in a subdirectory. I want to upgrade BI to 1.6 in order to install Invasio Barbarorum, but I don't know if the patch works only for BI or it upgrades the whole game (and so it may cause troubles with EB).
So, have I to make a copy of the directory of RTW in order to avoid conflicts, or can I proceed without fearing anything?