Here is a solutions for MAC PC:
Open terminal and type following command to show hidden files:
defaults write com.apple.finder AppleShowAllFiles YES
after that go to current user folder using finder, then you can see the Library folder in it which is hidden type
suppose in my case the username is 'Delta' so the folder path is:
OS X: ~Delta/Library/Preferences/SmartGit/<main-smartgit-version>
Remove settings file and change option to Non Commercial..