Mac users need to download and install Adobe Air in order to run this software: Download it here. Then proceed with Objective Proficiency software installation from the zip file.

To install Objective Proficiency Second Edition on a Windows XP SP3 Russian system, please follow these instructions below.

Download the zip file in the Resources tab. Then right click and extract all to unzip the folder.
Inside the folder, double click on the CambridgeApplicationInstaller application to start the installation process and follow the instructions on screen. You might come across an error message saying; "Installed successfully, but with errors". On a Windows XP SP3 Russian system the installer will only install the content, not the application
To install the application you need to download the Objective Proficiency. zip file
Then right click and extract all to unzip the folder.
Once unzipped, copy and paste this folder to this directory on your system: C:\Program Files\Cambridge\Objective Proficiency
When you first boot the software, it might give you a message saying that the content hasn't been installed to the default folder, and ask if you want to specify the location where it is kept.
On clicking to navigate to the folder, the default location should be the correct one, so you can just accept the prompt.