for HitFilm 3 Pro
Firstly, uninstall any existing copies of HitFilm 3 Pro that you already have on your computer.
Click the download button below that corresponds to the operating system you are running. This will download the installer to your computer.
The installer you download will be inside a zip file. You need to extract the zip file to get two installers. On Windows you do this by right clicking on the zip file and selecting the "Extract All..." option. On Mac OSX, simply double click on the zip file icon. This will leave another folder alongside the zip. Open this to see the two installers.
One installer contains HitFilm 3 Pro and the other contains the HitFilm plugins. Please run both the HitFilm 3 Pro installer files on your computer by double clicking on their file icons (this requires administrator privileges on your computer). Follow the on-screen instructions to complete the installation.
HitFilm 3 Pro is now ready for you to use!