If I have already purchased Photoshop cs6 and had it on my old pc which died and I have just purchased a Mac that you can not inset a disc into how do I get my photoshop again please tell me I do not have to purchase it again HELP ???
Was your old computer Windows?
The old perpetual licenses were platform-specific. A PC serial number will be rejected on a Mac.
The current subscription-based licensing is cross-platform and you can install on both platforms with one subscription.
It used to be possible to order a cross-grade to switch platforms. However, since CS6 is no longer sold by Adobe, I doubt you can still do that.
In short, perpetual suite licenses are a thing of the past, and by now the doors are shutting. I'd strongly recommend you to bite the bullet and get a CC license. The Photography Plan is only $10 a month, and you'll always stay up to date.