Installation Instruction: 1. After Downloading Burn or Mount the "Adobe Cs5.5 Master Collection.iso" (if not you can extract it with WinZip) 2. Patch the host file Then Run the Setup "Set-up". 3. During Installation when ask for serial just open your Required OS keygen either 32bit or 64bit 4. You will find further Detail instruction in Adobe CS5.5> Activation (please Read all the given instruction before installing)