Now I have tested to install the extension and the error is not in the .zip file... If we look at the error message it only says that the file could not be copied "Could not copy PHP install file"
That meens that the file exists but cannot be copied into the correct place.
This error will occur when the file install.php in NOT located in the root folder. You will find a fix for it here.
docs.joomla.org/Error_Component_Install:...stall_file_in_1.5.10
I have installed it for you and also updated the .zip file for others to download
Thank you for telling us about this issue!