Reverting to CS6

Many years ago I bought Adobe Design Premium CS6 (and CS2, CS5 etc before that). I duly registered it and used it for many years. I then moved onto Creative Cloud for a number of years. However I am not a professional, and the annual cost of the whole suite is too much to justify, so I now subscribe to Photoshop/Lightroom. I have tried reinstalling some CS6 programs which I use - mainly InDesign, Illustrator and Dreamweaver - using the original disc, including serial number. However when I try to open them I am only invited to sign up to Creative Cloud. When I went over to Creative Cloud from CS6 I was reassured that I could go back to CS6 if I chose to, but this does not seem to be the case any more. I cannot even find a record of my CS6 registration on My Account. Is there a way in which I can go back to using a product I have paid for and registered? Or was Abobe's promise that I could revert not really binding?