The download files for Courier Email have been tested and are good at the following link:

http://www.rosecitydownloads.com/courier3.exe 

Try this, RIGHT click on the EXE download link above and when the menu pops up, select Save target as... and save it to your desktop. After it downloads, simply double click on the Icon to start the installation.

Again we apologize for your inconvenience. We hope you enjoy using Courier like our many other satisfied customers. Please use the "support request form" link at the left if you have any further problems.