Resistance 3 IRD confusion

I originally downloaded Resistance 3 from here, along with the IRD on this site and converted it to ISO using the usual tool. I've since come to realise it's better to keep games in folder format and wanted to convert it back...

However, since the IRD's on here are all 404, I simply cannot verify the dump of this game, as every single IRD file for this game that I have downloaded since, marks three files as invalid.

Could the IRDs being shared online elsewhere be damaged? Is the game folder here damaged in some way? I seem to have no way of verifying the files for this game anymore...