To answer the question as it was asked, you'd still be able to play WotB after installing Alexander. The question is if you can use the alex.exe to play games made in rtw.exe, and that I don't know.
By the way, no, I "only" have 5 EB installs (the MP is the same as the backup), but I also have two clean versions of RTW so I guess that makes up for it. (Don't ask me why I have two of those, though.)
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