Reinstall Lightroom CC (2015 ) and Photoshop CC 18.1.7

I'm rebuilding my MacBook Pro 17" mid 2009 , running El Capitan , the highest OS supported since the original internal hard drive died and I have now put in a SSD . I previously had Lightroom CC and Photoshop CC installed , both still working on my MacPro and same versions , but Adobe no longer support these versions . I'm a retired photographer , have been an Adobe customer since early 1980s and have spent a lot of money with them , but can no longer justify more than the £10/month subscription . I have downloaded , from 3rd party sites Photoshop CC 2017 and LR6/cc but these are as trial versions , even though I have signed in to my Adobe account and it is recognised . How can I reactivate these pieces of software , which were previously working and I am still paying for ? Upgrading my laptop is not a justifiable option since my photography is now just a hobby .