If the Check condition box is marked, the task will be ran only when one of predefined conditions is valid.

File or folder - run the task if the specified file (folder) exists (or does not exist). Macro strings can be used in a file name field.

Environment variables - run task if one of the specified variables has the appropriate value. Macro strings can be used as a variable value.

 
The condition will be checked if the corresponding check box is marked.