inno setup - InnoSetup executing code before installation -


i'm attempting installing websites on iss trowh innosetup, first , need check if iss installed on machine; i've found code here on stack overflow, but, need check before all, before inno setup ask user he/she want install web site; so, need check @ first, before wizard page that, showing user string "chechinkg iss in machine" or this, , pass path iss located parameters "default" path in inno setup steps ask user install

thanks all


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