API	NPerformUpdate
Function	This is called to initiate an update of the custom engine. This call should be a synchronous call and wait until the update completes.

Function prototype

int PerformUpdate
(
)

Return value

Value	Description
0	Update completed successfully.
1	Failed to start or finish updating.
2	Engine is already up to date.
3	Failed to update due to network problem.
4	Engine is already updating.
5	Failed downloading update.
6	Failed reloading database.