Ryzom

This might not work for everyone but it did me. Run the game normally and when it patches and asks you to relauch click the button the get the error message. close the program and go into your ryzom folder in program files, then into the unpack folder, now move all those files into there correct spots in the ryzom folder and then restart the game and it should work. There will be like 3 files left over that you will not get a replace all box too i put those ones in the data folder just a fyi. Hope this helps some.

The fact that you have to move the files manually means that something in your system is not working properly or you do not have full permission to write the files. It could be antivirus software that blocks the overwriting of EXE files and causes the game to throw an error when that does not happen.