Firstly, just wanted to say thanks to Fabio for creating some sorely needed software in FS2020. I actually ran into the same issue as the user above where it wasn't saving the recording. I actually saw your comment to "run as administrator" which I did and that worked. Just seems weird that we'd have to explicitly select this option if the majority of us are already administrators on our machines.
Also, the recording isn't actually saved in the default folder provided: C:\Program Files (x86)\SimMarket\FlightControlReplay\FlightControlReplayMSFS
It saves one directory up.
Having said that....I finally have it working now, well enough...so plan on making a short video on it on my channel.
Thanks again for your hard work.