OT Can't add RR 2.6 to OS X Applications folder

[Jim Hurley]

This is one of the OS X mysteries which is beyond me. I have been 
able to add previous  version of RR to my applications folder but not 
this new 2.6.

When I try I get a message:

"The Item "Revolution 2.6 could not be moved because "Application" 
cannot be modified."

Get Info on the Applications folder shows it to be unlocked.

Suggestions please?

Jim