Hi
Maybe, this FSUIPC version is too old.
Please download the last FSUIPC version for FS2002. www.schiratti.com/dowson.html
and start FSrealWX with admin rights.
If you find an error, then please give me exactly about your system. Which sim (FSX / P3D / Xplane). Which connection (FSUIPC / SimConnect / FSrealWX-Bridge). Which OS.