Just found this if this is any help (though nothing is stated on Rockstars site)
--------
Some people have been unable to play the PSN download version of GTA 5 on PS3, reporting an 80029564 error. Sony says the problem should be resolved soon and require the existing content to be deleted, then redownloaded after 4pm.
GTA 5 download “error code 80029564″ to be fixed after 4pm
Here’s the full message from Sony which appeared on the EU forums:
Hi guys,
For those of you experiencing error code 80029564 when downloading or installing GTA V please accept our apologies.
This is been worked on as a high priority and we hope to have it resolved this afternoon. Please delete any GTA content you have already downloaded and then re-download after 4pm today. This should resolve the 80029564 error.
I will let you know if there are any changes to this progress and keep you all informed.
Thanks.