[Ifeffit] polarization

Hi, I study the sorption of Ni on single crystals of alumina by exafs . the angle made between the electric field and the sample is 90 and 0 . I read in “Exafs analysis using feff and feffit , matthew Newville, j.synchrotron rad (2201), 8,96-100” that we can use feff and feffit to calculate exafs spectra . I have three questions: In this reference authors uses a feff7 Can I use feff6 or I need a feef recent version ? There is a manual that explain how to write a feffit.inp file? How I can include the polarization dependence on my calculation? Asma