hi all,  i was using autocad LT trial version just a couple days ago.  i decided to buy the subscription for one year.  i uploaded the new file to computer and opened it on apple computer.  on same day of purchase, apple computer indicated there was a software upgrade available for computer.  i hit the upgrade button and all looked well.  next day i tried to open autocad lt and it wont open program.  is this happening to other Mac users who upgraded to latest apple software?  is there a fix?