1. Unzip
2. Copy the folder Redfield  with the files in the Photoshop plugins folder 
C (or your hard drive): \ Adobe \ Adobe Photoshop CSX \ Plug-Ins \ Redfield \
for Windows 32 bit from the folder x86
for Windows 64 bit from the x64 folder
Remove plugins can delete this folder
2. Enjoy ! (You may always change the registration name by using Registration.exe).