Because of the size of these games, there is a problem with the Unpack process....
an update of the application would fix that bug, but never come.

You may not able to delete the files that already created by the application.
the easy way you fix that, is to connect N900 as a mass storage, with a Windows-pc and: Properties-->tools--> check the driver for errors.

I dont say, that application isnt good, but with these games many users have problemS....

i installed nova and hero of sparta successfuly, but driver never installed.