With CS6 Adobe discontinues boxed versions of it’s creative software. In the future they will only be available throgh the Creative Cloud subscription service. Of corse the previously owned boxed versions will continue to operate, but you cannot buy them and the company releases no more updates to them to increase their compatibility or stability.
Adobe recently introduced the tablet version of their popular photo editing software Lightroom. The new application has a great emphasis on cloud based photo management, but you can try it without a Creative Cloud subscription.