Alternate Install Directory

Good morning Geeks, I am running XP Home SP3.
Because I believe that NO virus/malware software is 100%, I have installed on an external hard drive supplemental virus apps that I run randomly on weekends. One of my favorites has been Emsisoft (a2) because it finds Trojans that others miss. And I know that I can't use two virus apps on the same drive. Here is the problem.
Emsisoft recently upgraded to V6, and during the install there is NOT the usual option to select a directory, it defaults to the "C" drive. Emsisoft says that I can select a different director using the following:

EmsisoftAntiMalware6Setup.exe /DIR=I:\Program Files\EAM

However, I can't rename the file because the symbols used are not allowed in XP. What do I do? Is this a command line install (which I have never done)?