I have trained Photoshop throughout my career as a software trainer, introducing, grounding and encouraging many in their use of this comprehensive, clever - and to me, delightful - suite of tools and actions. Befire I retired, I was working with CS4. For a while, it ran ok on Windows 10. Then, after a system crash which necessitated a complete rebuild, I found that my copy of CS4 would no longer install. I am now using Elements, and I'm afraid I am experiencing severe withdrawal symptoms. I pretty well knew my way around CS4. I am just so sad that the software I self-trained in and grew to love is no longer available to me. As a retiree, I just can't justify purchasing a later edition.