Penumbra Overture patch question

[zygzak]

You bought Penumbra Collection, right?
If I'm not totally wrong that includes all the latest patches for the games...

Yes, I bought it as Collection of two games - the second is Black Plague.
But that it is in collection is not as sure as it contains any latest patches.
Is there any way to check this? Maybe by checking exe file version (you know, right click, properties, and there should be some info)?
If I have latest version, and latest intel X3100 drivers what can I do to
eliminate chessboard texture effect?