2nd WoW not updating

I dual box and am using Keyclone. I made a copy of my wow.exe file and use keyclone to connect to the 2nd account. Every patch that comes out is not updating the 2nd account. After login I go to the patch screen which tells me I require download of the new patch. The download blazes thru (I'm assuming it already finds the patch on my PC) then gives me this error.
The file "C:\Users\Public\Games\World of Warcraft - Copy\WoW.exe" could not be read. If this problem persists, you may be able to solve it by uninstalling and then reinstalling the game. If you are unable to correct this problem, please contact Blizzard Technical Support.

After the recent 3.2 patch, I deleted my copy and made another but is there a way to have the 2nd account update with new patches or do I have to make a copy after every update?

Thanks

I have this problem as well. I think what I do is ...

1) Find the downloaded patch and copy it into the wow folder of the 2nd account (same place as launcher).
2) Run the launcher manually from the wow folder of the 2nd account.

And make sure you close the 1st wow before trying to patch the second. That get you past that.