<p>You will have to contact a human at Adobe and see if they will *still* do a 'platform swap'. They used to do that in the pre-CC days and it was about $25, a piece of paper and a promise that you deleted the old software. However, these days, they might not be willing to do that and simply say 'you must go to CC'.<br>
Yes, LR is/was a cross-platform license but PS never was (pre-CC).</p>