My condolences . Contact Adobe CS.
Basically, I've had CS4 on Win, then upgraded to CS5.5 (boxed version on Win, however I need to switch platforms now and upgrade to CS6. What is the process please?
Thank you in advance.
First thing's first: ignore Harm and the other PC bigots.
Now that that's over: what do you mean by the "process?" Purchase the upgrade through Adobe's online store and download the DMG file from them. Once you have it, install it, and when it asks for the license of your previous version, enter in the CS5.5 one from your Windows box.
Is that what you were looking for? Or something else?