I updated, from the Creative Cloud, LR 5.6 to LR 5.7 and now the program will not start. No error messages are sent as far as I can see. I have deleted it twice and re-installed it and it still fails. I even went to the trouble of installing a down level 4.4 to see if this would help, but on start up the program can not use the 5.6 file and so in effect I have no LR. any suggestions or help would be appreciated.