Shadow
Shadow comes packaged in the VFX Suite installer. Since Shadow is a plug-in, you must first have installed a compatible host program. Once launched and its prompts have been followed, the installer will automatically place the required components in whichever directories are needed.
Close any and all host applications: Adobe Premiere, Adobe After Effects, Final Cut Pro X, DaVinci Resolve, etc. should all be closed prior to running the installer.
Agree to License Terms & Service: Once the installer's launched, agree to the terms and service before proceeding, then click Continue .
Product Selection: Check off any plug-ins you'd like to install onto your system. If you don't own one of the plugins listed, you can still install it as a trial version, which will help provide an idea of how the plug-in runs on your system.
Install: After clicking Install, the installer will then, well, install everything. The installer may ask for administrative credentials after this step due to placing files in directories that will be accessible by all users on the system.
Installation Complete/Enter Licensing Info: Once the installation's complete, use the Enter Licensing Info... button to enter your serial number(s). This step can also be completed through the plug-in Effect Controls window.
You may now close the installer and head into the host program.