I recently switched to FSX and tried to implement the PSS A3xx. I followed the above instructions (by copying all files into FSX/aircraft folder). Everthing does work BUT the APR or LOC modes would not engage. When I am on the localizer and press the APR button nothing happens. Same with LOC button, no reaction. The buttons whow up as clickable, but no reaction? What am i doing wrong in my FSX. I have a registered FSUIPC version?
Found the "Solution": I have entered a FP into the MCDU and then also the APR button does work :-)
Best regards Helmut