If you want to use PPK then RTK should be off. This allows the proper logging to happen so that you have all the necessary files for post-processing. I use RTKLIB for post-processing. Some use EZSurv as it is a little more refined and intuitive, but it is also pretty expensive. RTKLIB is free and honestly once you have walked through the process a few times it is really not very hard.
RTKCONV and RTKPOST are the actual programs that are part of the RTKLIB “suite”. You use RTKCONV to convert RINEX and BIN data to the OBS and NAV formats you need for RTKPOST.