Issue with installing Lightroom CC on mac

Hi there,
I'd really appreciate some advice.
I successfully installed PS CC on my old mac laptop, but forgot, intil last week that my subscription also includes Lightroom. I have tried, unsuccessfully, to install it.
However, I just get an error message of A12E1 as it attempts to install.
I hope someone is able to help.
Thanks in advance.
Michele Dillon

A12E1 error installing Creative Cloud products | CC
For anything beyond that you will have to provide proper technical information, which you haven't done so far.
Mylenium

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