I have an Adobe Lightroom perpetual license.
If you had it installed on Mojave and upgraded to Lightroom, it would work.
However, i committed the cardinal sin of installing a fresh Catalina copy and it wouldn't let me install Lightroom anymore !!
The app is apparently 64 bit but the installer is 32 bit.
Anyway, here begins my ordeal with support. Having stated the above, the drones tried redirecting me to download the 32bit copy twice.
One was cheeky enough to suggest that i use Adobe forums for answers (seriously?) and finally one slightly sensible drone gave me the dreaded answer "Its currently not supported. We will let you know once it is. Meanwhile, <link> is where you can buy Creative Cloud...."
Whatever happened to agile development ?
Shame that Adobe and Apple cant get their act right.