Not many ideas here, sorry….
Maybe your setup files are corrupt.
Uninstall your current install.
Download Falcon BMS 4.32 Setup BASE plus U1-U7 (900 MB) from here:
http://www.mediafire.com/download/j7e3nqyhwr7emlf/Falcon_BMS_4.32_Setup_BASE_plus_U1-U7.rar
Then please follow one of those install procdures:
http://simhq.com/forum/ubbthreads.php/topics/3660698/Starting_with_Falcon_4_BMS_Upd#Post3660698
or
https://www.benchmarksims.org/forum/showthread.php?13273-How-to-install-BMS-4-32-U4
Cheers,
LS