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Coming from Lightroom 6.14
Just trying to install Lightroom Classic from the DMG on my Mac and get error code P1 - can't install.
Terrible first impression, Adobe (not to mention that my firewall shows all the spyware connetions that Adobe is making).
If I even manage to start my trial there are already a couple of marks against using Adobe products in the future...
From my experience v5.7 > Classic (in Windows), my suggestion would be-
1) Backup your Catalog and image files
2) Run the Creative Cloud Cleaner Tool to un-install all Adobe products
3) Install the Adobe Creative Cloud Desktop App
4) Use the CC Desktop App to install your subscribed software (Lightroom-Classic) (Do not use a DMG)
Creative Cloud Cleaner Tool to solve installation problems
CREATIVE CLOUD APP DOWNLOAD