Where did you install EB 1.1? You did that in the RTW folder, let's say for example "C:\Games\RomeTW". Replace that with wherever you actually installed it in all instances below.
You need to select the same location as EB 1.1 when installing EB 1.2. When you browse and find the location, it will display as "C:\Games\RomeTW\[First select your RTW where EB1.1 is, then remove this]". The next step is to remove the latter part, so that it again reads "C:\Games\RomeTW" (or "C:\Games\RomeTW\", that last slash doesn't matter). Then you should be good.
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