I always download and install the software with antivirus disabled. however, the problem did not take place upon installation, i have had all FSDT products working then all of a sudden it stopped working. Anyway, i have found the solution, where it was an issue related to FSX not closing correctly as a result it messed up with FSUIPC, that resulted into this problem. i have found the solution by deleting wxstationlist.BIN from the appdata.
Thanks for the help anyway