Are you asking if EOS Utility 3 will work with your 750D?
And the answer is that it should if you also have EOSU 2 installed. EOSU 3 is incompatible with most (all?) Rebels, but it knows that and automatically calls EOSU 2 if necessary. At least that's how it used to work; I haven't tried it with the latest release of EOSU 3.
Also, recent EOSU 3 installation files will install EOSU 2 at the same time unless you tell it not to.