Lightroom 5 - download

After a few years hiatus, i want to get back into my photography.  I went to reinstall my copy of Lightroom 5 onto my mac (High Sierra) but the installer is not available.  Adobe won't give any support on this product anymore other then telling me to upgrade to a plan, so I'm trying my luck in the community.  I'm a little cheesed that I can't use a program I paid for unless I spend more money, but what can I really do at this point?  Anybody have a suggestion or solution to this?  Somewhere I can go to get the installer?... or even better, another product I should consider?  Thanks in advance! I'm looking forward to getting back into this!