REMOVE OLD ADOBE INSTALLATIONS (IF APPLICABLE) BEFORE INSTALLING ADOBE CS5
Remove the following Adobe applications and files before installing the Adobe CS5 Master Collection:
/Applications/Adobe? (everything with Adobe)
/Library/Application Support/FLEXnet Publisher
/Library/Preferences/com.adobe... (everything with com.adobe)
~/Library/Preferences/Acrobat Distiller Prefs
~/Library/Preferences/Adobe... (everything with Adobe)
~/Library/Preferences/com.adobe... (everything with com.adobe)
INSTALLATION OF ADOBE Illustrator CS5 (Or any other CS5 pruduct)
Disconnect from network/internet (Turn AirPort Off). Double click "Adobe CS5 Master Collection.dmg" to install the Adobe CS5 Master Collection. Whilst installing CS5, ensure that you choose "Install this product as a trial" and DO NOT enter any serials. If you've already installed CS5 applications using a serial, load any of the installed CS5 applications and select Help > Deactivate. Quit all of the installed CS5 applications.
Launch a Terminal window (in /Applications/Utilities) and copy and paste: sudo /Applications/TextEdit.app/Contents/MacOS/TextEdit /etc/hosts
Hit return and type your admin password.
The "hosts" file should automatically open in TextEdit.
If the following lines are already part of the "hosts" file close it and continue with the "Finish" section. If not hit return (in the opened "hosts" file) and copy and paste following lines: