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Hi I just upgraded my MAC to Catalina...
And all my LR previus downloads are giving me a hard time.
LR 4 needs the serial nr, which I bought from B and H but I don't have the nr anymore, but prove of purchase.
Lightroom 6 is giving me an arror message 16 when I want to install it again.
You cannot install Lightroom v6 (or v4) in Mac Catalina.
Catalina is strictly 64bit. The v6 installers are 32bit.
An annual subscription to the Photography Plan (20Gb) will get you back to speed with Lightroom-Classic.