For All Su-25T training lessons in one distributive file AND All Ka-50 training lessons in one distributive file BOTH downloaded FROM http://www.digitalcombatsimulator.com/en/downloads/video/ :   
when i launched a training mission, DCS WORLD immediately crash and windows 7 64 informs me that DCS has stopped working.   
please help, 
thanks, 
gger   
version: DCS_World_en_1.2.0.63205 / KA-50_1.2.0.63205