How can I open CS6 after receiving the following warning: The following disk images couldn't be opened - MasterCollection_CS6_LS16.dmg Reason:Invalid Checksum.
This would indicate the download is not complete or is damaged. Do you have any messages in the Adobe Download Assistant?
I'm having the same issue and no messages in the Adobe Download Assistant.
If you open the .dmg folder, you have a choice of Cancel or Skip in the dialogue box while CS6 is verifying, immediately press the skip button and CS6 will install.