adobe's no longer selling lr 4. if you have serial number from a previous purchase, you should be able to activate lr 4 or 4.1.
otherwise, you might be able to upgrade your os to mavericks, Apple - Upgrade your Mac to OS X Mavericks.
adobe's no longer selling lr 4. if you have serial number from a previous purchase, you should be able to activate lr 4 or 4.1.
otherwise, you might be able to upgrade your os to mavericks, Apple - Upgrade your Mac to OS X Mavericks.