Hi, I think your problem is caused by an update of the simconnect protocol. Freetrack hasn't been updated since 2008, so it is still using an very old version of simconnect.I know that Facetracknoir and Opentrack are still updated and can be a good alternative for Freetrack and also have the latetest simconnect protocol
Opentrack is free to use, for Facetracknoir is asked a small fee.
http://www.facetracknoir.nl/
https://github.com/opentrack/opentrack/releases
Iam sorry for replying in English.My French is worse than my English